1.	A.1.00 Empty demo | Request This is an empty demo to practice the procedure of request.
2.	A.1.10 Coordinate system | Request A model to help to visualize and explain the concept of the three dimensional rectangular coordinate system.
3.	A.1.20 Diagonal of a rectangular block | Request A wireframe to show the Eucledian distance between two opposite corners of a rectangular block.
4.	A.1.30 Handheld vectors | Request Models to help to explain the mathematical concept of vectors, vector addition and vector subtraction.
5.	A.1.40 Right hand rules | Request Three large foam right hands on a wood stick to teach the right hand rules and the vector product.
6.	A.1.50 Radians (ohp) | Request A pie model with plastic wedges to help to explain the geometrical definition of radian.
7.	A.2.00 Another empty demo | Request This is just another empty demo to practice the procedure of request.
8.	A.2.10 Basic metric units | Request Definition of the standard metric units of length, time and mass.
9.	A.2.20 Powers of ten (video) | Request Travels through the length scales from the size of a human to the size of the Universe and back. Then from the size of a human to the size of the atomic nucleus.
10.	B.1.00 Frames of reference (video) | Request The relativity of the reference frames is explained in a very entertaining fashion.
11.	B.1.03 Constant velocity motion on the air track | Request The cart moves with constant velocity between the two ends of the track. At the ends it bounces back.
12.	B.1.05 Uniform acceleration on the air track | Request A cart accelerates downhill on the air track. It passes a marker flag at every metronome click. The distance versus time function is drawn.
13.	B.1.10 Sound of constant acceleration | Request One string has leads at certain distance ratios. When the string is dropped the weights are heard to hit the floor at even time intervals. The other string has leads at even distances. When this string is dropped, the weights hit the floor at an accelerating rate.
14.	B.1.15 Determination of g with electronic timer | Request A metal ball is dropped from a given height. The time of fall is measured by a high resolution electronic timer. The gravitational acceleration is calculated from the height and the time of the fall.
15.	B.1.20 Galileo on the Moon (video) | Request Galileo's feather and heavy weight experiment done on the Moon by an astronaut.
16.	B.1.25 Feather and coin | Request The feather falls much slower than the coin because of the air drag. When the air is removed from the tube, they fall together.
17.	B.1.30 Pop and drop | Request Two balls - one simply dropped the other popped horizontally - hit the floor at the same moment if they are released together.
18.	B.1.35 Ballistic cart | Request A projectile is launched vertically from a cart moving with constant velocity on the horizontal track. The projectile returns to the cart.
19.	B.1.40 Shoot the monkey | Request A hanging monkey is targeted by a spring gun. When the projectile leaves the barrel, the monkey starts to fall freely under gravity. Will the monkey be hit?
20.	B.1.45 Two racing balls | Request Two balls are racing each other on two different tracks. Which one will win?
21.	B.2.00 Newton's first law | Request The cart keeps moving and bouncing between the two ends of the air track when the friction is reduced.
22.	B.2.05 Newton's second law | Request A cart loaded with different masses is accelerated on the dynamics track.
23.	B.2.10 Broken hand | Request A very heavy metal ball is caught in the air by a volunteering student. It is not a problem if yield is allowed. When the student is asked to catch the ball holding the hand on the surface of the table he/she - very wisely - refuses.
24.	B.2.15 Bungee jumpers | Request Bungee jumpers jump using two different cords: an elastic rubber, and a steel cords. The jumper with the rubber cord swings up and down happily, but the jumper with the steel cable breaks his neck.
25.	B.2.17 Catching the egg: wood board versus cloth | Request Two teams of students try to catch an egg dropped from the top of the ladder. One team has a wood board, the other team has a soft cloth. Which team will succeed?
26.	B.2.20 Atwood's machine | Request When the masses on the two sides of the machine are equal they stay at rest, or move at constant velocity. When the masses are not equal, the system accelerates.
27.	B.2.25 String breaker | Request A slow and steady pull on the bottom string breaks the top string. A quick jerk on the bottom string however breaks the bottom string itself.
28.	B.2.30 Inertial mass | Request Masses of different size are accelerated by oscillation on the platform of the balance to measure inertial mass.
29.	B.2.35 Weight in free fall | Request When a mass is accelerating downwards, its apparent weight is reduced. When it falls freely, its apparent weight is zero.
30.	B.2.40 Newton's third law | Request Two force scales are connected to each other and pulled by two volunteering students. The students are instructed to pull different forces. They cannot do that, they always pull each other with the same force.
31.	B.2.50 Sliding block | Request Friction is (approximately) independent of the size of the contact area.
32.	B.2.55 Dragging the box | Request Friction is (approximately) independent of the relative speed of the surfaces in contact.
33.	B.2.60 Angle of repose | Request The slope of the inclined plane is gradually increased until the object starts to slide.
34.	B.2.65 Balancing a meter stick on two fingers | Request A meter stick is held horizontally on our two index fingers. When the two fingers are moved toward each other, they always meet under the center of gravity of the stick.
35.	B.2.70 Kinetic friction and normal force | Request A block is dragged on an iron plate with its nonmagnetic side and the friction force is measured by the force scale. Then the block is turned to the magnetic side. The scale reads larger force this time.
36.	B.3.10 Lifting weight | Request A heavy metal ball is lifted up and carried around by the demonstrator to introduce the concept of mechanical work.
37.	B.3.15 Energy bike: work and power | Request Volunteering students pedal the energy bike. Both the instantaneous power and the total work done is displayed.
38.	B.3.20 Jumping spider | Request A spring driven toy spider is compressed. The work is stored by the spring. When the suction cup releases the toy, it jumps to a height.
39.	B.3.25 Piledriver | Request The piledriver drives a nail into a piece of wood as an example of transforming potential energy into work.
40.	B.3.30 Saving face | Request The bob is pulled back to just touch the demonstrator's nose. The demonstrator releases the pendulum without pushing and stands perfectly still. The pendulum will return to the same position without doing any damage.
41.	B.3.35 Galileo's pendulum | Request As the pendulum swings, the string hits a metal rod forming a shorter pendulum. This short pendulum rises to the same level as the original long one.
42.	B.3.40 One racing ball | Request A metal ball rolls through two different tracks. The tracks start and finish at the same heights, but they differ in the middle. The final velocities of the ball are measured by how far it flies after leaving the tracks.
43.	B.3.45 Uphill cone | Request The uniform rod rolls downhill toward the lower closed end. The double cone rolls uphill toward the higher open end. Which one is right?
44.	B.4.00 Two body system | Request Two spheres with different masses are connected with a thin metal rod. The system pivots freely only around one special point, the center of mass.
45.	B.4.05 Collision at a distance | Request Two carts equipped with magnets are approaching each other. They bounce back before they touch.
46.	B.4.10 Inelastic collision of velcro carts | Request A cart collides inelastically with another identical cart which was initially at rest. The velocities are measured with the photogates before and after the collision.
47.	B.4.15 Conservation of momentum in an explosion | Request Two air track carts fly away from each other when the gunpowder cell explodes. After they bounce back from the two ends of the track they meet again and they come to rest they were initially.
48.	B.4.20 Ballistic pendulum | Request A projectile collides with a pendulum inelastically. As a result the pendulum deflects to a certain angle.
49.	B.4.25 Newton's balls (ohp) | Request Steel balls are suspended along a line as bifilar pendula. When a ball or balls are drawn back and released on one end, the same number of balls will swing out on the other end.
50.	B.4.27 Ninja balls | Request Elastic rubber balls are on a rod in the order of decreasing size. When the system is dropped and hits the floor, the smallest ball shoots out at a very high speed.
51.	B.4.30 Elastic collision of unequal (3:1) masses | Request Two suspended metal balls with a mass ratio of 3:1 collide with each other elastically.
52.	B.4.35 Coefficient of restitution | Request Balls made out of different materials are dropped from a given height above a flat steel plate. They rebound to different heights depending on the energy lost in the collision.
53.	B.4.40 Superball and clayball | Request Two identical looking black balls are dropped. One of them bounces back high, the other does not bounce at all.
54.	B.4.45 Time of elastic collision | Request An elastic rubber ball is dropped on an electric sensor pad. The time track of the interaction is displayed on the oscilloscope screen.
55.	B.4.50 Water rocket | Request A rocket driven by pressurized water is launched as an example of the action-reaction principle.
56.	B.5.00 Ball on a string | Request A heavy ball is kept on a circular orbit by a rope.
57.	B.5.03 Whirligig | Request A metal ball is kept on a circular orbit by a rope pulled through a pipe and held by hand or a weight.
58.	B.5.06 Air table centripetal force | Request A puck is kept on a circular orbit on the air table by a rope pulled by a weight.
59.	B.5.09 Leaving circular orbit | Request When the constraining force is gone, the ball leaves the circular orbit along a straight line tangential to the original circle.
60.	B.5.12 Flying poker chips | Request Poker chips are spun on the rotating table. They are kept on orbit by static friction.
61.	B.5.15 Conical pendulum | Request A mathematical pendulum is spun on a cone, the bob orbits on a circle.
62.	B.5.18 Circular motion by normal force | Request Two ball bearings are kept on a circular orbit by normal force on a rotating semicircular constraint.
63.	B.5.21 Flattening of the Earth | Request When a flexible metal circle is rotated around its diameter it deforms.
64.	B.5.24 Loop the loop | Request A small ball rolls down on an incline and then enters a vertical loop.
65.	B.5.27 Meter stick balance | Request Masses of different sizes are balanced on a meter stick at different distances from the point of support.
66.	B.5.30 Where is the doorknob ? | Request Torque is the product of the force and the arm. If the arm is small we need big force to open the door. If the arm is big then a small force is enough.
67.	B.5.33 Short and long wrench | Request When the short wrench is not enough, use the long one.
68.	B.5.36 Pulley races | Request The same weight accelerates the pulley at different rate at different radii.
69.	B.5.39 Rotating weights | Request Two masses at adjustable distance from the axis of rotation are accelerated angularly by several different weights hung on the rope.
70.	B.5.42 Mystery batons | Request Two batons with the same mass but with different mass distribution are spun back and forth by hand.
71.	B.5.45 Off-loaded cylinder | Request A geometrically asymmetric object rotates freely around one of the three mutually orthogonal free axes going through the center of mass when it is thrown in the air.
72.	B.5.48 Descending spool | Request A spool accelerates both linearly and angularly as it descend.
73.	B.5.51 Walking the spool | Request If the rope is at a high enough angle, the spool runs away. If the rope is at a low angle the spool comes back. At a critical angle the spool slides on any surface.
74.	B.5.54 Inclined plane races | Request Solid and hollow cylinders roll down on an incline at different rate.
75.	B.5.57 Falling rods | Request A short and a long rod starts falling at the same time. Which one will land first?
76.	B.5.60 Faster than gravity | Request The free end point of a linear homogeneous straight rod accelerates at three half of the gravitational acceleration when the rod is in a horizontal position.
77.	B.5.63 Bicycle wheel | Request A small and a big bicycle wheel is spun and then held in hand to experience the strange behaviour of spinning objects.
78.	B.5.66 The stranded demonstrator | Request A person tries to spin himself on the rotating chair without any external help.Can he/she succeed?
79.	B.5.69 Rotating chair and throwing weights | Request A person sitting on the rotating chair throws and catches heavy weights in order to spin up him(her)self.
80.	B.5.72 Spinning skater | Request A person is spun sitting on the rotating chair with weights in hands. The weights are then moved in and out to simulate a spinning skater.
81.	B.5.75 Rotating chair and bicycle wheel | Request A person sits on the rotating chair with the rotating bicycle wheel in hands. The wheel is then flipped.
82.	B.5.78 Rotating chair and double bicycle wheel | Request A person sitting on the rotating chair flips the double wheel with the two wheels spun in the same direction, then in the opposite direction.
83.	B.5.81 Hanging bicycle wheel | Request The rotating bicycle wheel is hung on a rope from the ceiling. It behaves very strangely, it does not fall, it precesses under torque.
84.	B.5.84 Suitcase gyroscope | Request A volunteering students walks around with a suitcase. The suitcase behaves very strangely at sharp turns. What is in the suitcase?
85.	B.5.87 Handheld gyroscope | Request A gyroscope is held in hand and moved around to show the conservation of angular momentum.
86.	B.5.90 Wrap around | Request An object orbiting at the end of a rope moves faster and faster as it wraps itself around the constraining cylinder.
87.	B.5.93 Foucault pendulum | Request The plane of a pendulum remains unchanged under a rotation around the vertical axis through the suspension point.
88.	B.5.96 Rotational to translational energy | Request A spool with large radius rolls down an inclined plane, and then touches the table and rolls horizontally. On the incline the spool accelerates slowly, when it touches the table it accelerates swiftly.
89.	B.6.00 Force board | Request Balancing forces with different sizes and directions.
90.	B.6.10 Cable pull | Request You can exert a much bigger force by pulling perpendicularly on a cable than in parallel.
91.	B.6.20 Irregular shape | Request Finding the center of gravity of an irregular object.
92.	B.6.30 Leaning towers | Request Adding the top piece or rotating the top piece on the towers make them unstable. The green block is more stable on one end than on the other.
93.	B.6.40 Hanging hammer | Request Adding a sledgehammer to a hinged bar makes it stable in a horizontal position.
94.	B.6.50 Green wing | Request The center of gravity can exist outside of an object and the object supported at this point will be balanced.
95.	B.7.00 Mass and weight | Request Gravitational mass is measured with a two armed balance. Weight is measured with a spring scale. What would these instruments measure on the Moon for example?
96.	B.7.10 Gravitational equivalence principle | Request In a system accelerated in one direction behavior is the same as in a system at rest, with gravity in the opposite direction.
97.	B.7.20 Cavendish balance | Request The gravitational interaction is detected by the deflection of the Cavendish balance.
98.	B.7.30 Drawing an ellipse | Request Two magnets and a rope help to draw an ellipse with chalk on an iron chalk board.
99.	B.7.40 Solar system model (mechanical) | Request A mechanical model to show the relative positions and phases of the Moon with respect the Earth.
100.	B.7.50 Solar system model (tennis balls on rope) | Request Tennis balls strung on a rope to model the relative positions of the planets.
101.	B.7.60 Celestial sphere | Request A plastic celestial sphere with Earth in the middle.
102.	B.7.70 Black celestial sphere | Request A big black metal sphere to draw with chalk on it.
103.	B.8.10 Hooke's law | Request A spring is stretched by several different weights and the deformation is measured. The force versus deformation function is then drawn.
104.	B.9.00 Manometer | Request A mercury manometer which measures atmospheric air pressure.
105.	B.9.02 Barometer | Request A big barometer which measures air pressure in mercury millimeter.
106.	B.9.05 Hydraulic press | Request A hydraulic press capable to crumple aluminium pipes or other objects.
107.	B.9.10 Magdeburg hemispheres | Request The air is pumped out from inside the two hemispheres. Two volunteering students try to separate them unsuccessfully.
108.	B.9.15 Crush the can | Request When the air is sucked out from inside a metal can the outside air pressure crushes it.
109.	B.9.20 Archimedes' principle: wet | Request When an object is submerged in a liquid, its weight is reduced by the weight of the displaced liquid.
110.	B.9.25 Archimedes' principle: dry | Request In air two objects weigh the same as shown by the balance. When the chamber is evacuated the larger object sinks: there is bouyancy in air.
111.	B.9.30 Archimedes' principle: two fluids | Request When a lighter fluid is carefully poured on top of a heavier one, the floating object rises.
112.	B.9.35 Hydrometer | Request A very simple device which measures the density of a liquid as it floats in it.
113.	B.9.40 Cartesian diver | Request When the pressure of the liquid is increased, the air in the diver compresses resulting larger average density. The diver therefore sinks.
114.	B.9.45 Venturi tube | Request When the speed of the gas flow increases the pressure of the gas decreases.
115.	B.9.50 Bernoulli ball | Request An air balloon or ping-pong ball can be levitated in the air by the blower.
116.	B.9.55 Bernoulli plate | Request A flat metal plate is lifted when air flows above it at high speed.
117.	B.9.60 Bernoulli cart | Request A cart equipped with a vertical rotating cylinder moves perpendicular to the external air-flow.
118.	B.9.65 Rising ball | Request A ping-pong ball is captured in an upside down funnel by the air-flow.
119.	B.9.70 Moving cans | Request When air is blown between two empty cans, they move towards each other.
120.	B.9.75 Spinning cup | Request When the cups are dropped with a spin, they move sideways.
121.	B.9.80 Two coke bottles | Request Two coke bottles are joined together. When simply flipped the water flows turbulently. When spun around, the water forms a vortex.
122.	C.1.00 Ceiling pendulum | Request A long pendulum is hung from a hook on the ceiling and swings back and forth. The periodicity of the motion is demonstrated by measuring the period several times.
123.	C.1.05 Simple harmonic motion on the air track | Request A cart connected to the two ends of the air track with springs oscillates horizontally back and forth. The periodicity of the motion is demonstrated by measuring the period several times.
124.	C.1.10 Mass and spring | Request A mass hangs on a spring and oscillates vertically up and down. The periodicity of the motion is demonstrated by measuring the period several times.
125.	C.1.15 Driven mass on a spring | Request A mass on a spring oscillates very differently as the electromagnetic suspension point is driven by a signal generator at different frequencies.
126.	C.1.20 Circular motion projection (ohp) | Request When an object moves on a circular orbit at constant angular velocity, its projection performs simple harmonic motion.
127.	C.1.25 Lissajous oscilloscope figures (video) | Request Two harmonic voltages are fed into the two perpendicular inputs of the oscilloscope. Lissajous figures are seen on the screen.
128.	C.1.30 Parallel pendula | Request Two pendula with length ratio of 4:1 have period ratio of 2:1.
129.	C.1.40 Period of a physical pendulum | Request A straight wood ruler is suspended at different points between the end and the midpoint. The periods of the oscillations are measured.
130.	C.1.45 Variable g pendulum | Request When the rotational axis of the physical pendulum is tilted around the horizontal axis perpendicular to the rotational axis, the period of the pendulum increases.
131.	C.1.50 Torsional pendulum | Request A torsional pendulum performs angular harmonic motion as an analogous motion to translational harmonic motion.
132.	C.1.55 Wilberforce pendulum | Request A mass hangs at the end of a spiral spring. When set in motion, the system oscillates between the simple translational spring mode and the torsional mode.
133.	C.1.60 Elastic pendulum | Request A mass hangs at the end of a spring. When set in motion, the system oscillates between the simple spring mode and the pendulum mode.
134.	C.1.65 Tonal pendulum | Request A mass hangs from a wire over a resonant box. As it swings, the wire is plucked, and the variation in tension is heard as variation in pitch.
135.	C.1.70 Inverted pendulum | Request Driving the pivot point of a physical pendulum at a high frequency creates an effective gravitational acceleration. The pendulum can be turned sideway or even inverted into upside down position while oscillates.
136.	C.2.10 Rubber hose | Request A long rubber hose hooked to the wall at one end and held by hand at the other to show the propagation and reflection of transverse pulses and waves.
137.	C.2.15 Handheld slinky | Request A long slinky fixed at one end and held in hand at the other end to show the propagation of a longitudinal pulses and waves.
138.	C.2.20 Transverse waves | Request A series of metal bars connected by a metal wire to demonstrate the propagation of transverse pulses and waves.
139.	C.2.25 Longitudinal waves | Request Suspended straight metal rods connected to each other by springs to demonstrate the propagation of longitudinal pulses and waves.
140.	C.2.30 Standing wave machine | Request Transverse standing waves are produced in a rope which is fixed at both ends.
141.	C.2.35 Driven slinky | Request A horizontally suspended slinky is driven at one end. When the condition for the driving frequency is met, longitudinal standing waves are observed.
142.	C.2.40 Flame wave | Request A long metal pipe with a series of small holes is filled with gas. The gas is ignited and a standing sound wave is set up by a speaker and a signal generator. The heights of the small flames show the nodes and antinodes of the standing longitudinal wave.
143.	C.2.45 Wave open at one end | Request Transverse standing waves are generated in a spring with one end fixed and the other free.
144.	C.2.50 Wave open at both ends | Request Transverse standing waves are generated in a spring with both ends free.
145.	C.2.55 Bead board model of superposition | Request A mechanical model to demonstrate the constructive and destructive superposition of harmonic transverse waves.
146.	C.2.60 Sine wave through a slot | Request A sine wave is painted on a black board. As the board is slid behind a vertical slot we see a dot oscillating up and down.
147.	C.2.65 Squirrel cage projection (ohp) | Request The projection of a spiral on a cylindrical wire cage is a sine wave. When the cage is rotated, the projection becomes a traveling transverse wave.
148.	C.2.70 Standing and traveling wave projection (ohp) | Request A small box containing one planar sine wave and one cylindrical spiral shaped wire. When the wires are rotated, their projections show a standing and a traveling wave respectively.
149.	C.2.75 Ripple tank (ohp) | Request A ripple tank for the overhead projector to show different waves and wave phenomena.
150.	C.2.80 Tacoma Narrows bridge (video) | Request A video showing the catastrophic resonance and collapse of the Tacoma Narrows bridge on November 7th, 1940 caused by strong winds.
151.	C.2.85 Circular loop slinky | Request A closed loop slinky suspended in a horizontal plane to show the different modes of oscillations in a circular system.
152.	C.3.10 Bell in vacuum | Request An electric bell is placed inside a vacuum jar. When there is air in the jar, we can hear the bell. As the air is removed by the vacuum pump the sound becomes fainter and fainter.
153.	C.3.15 Frequency and the limits of audibility | Request A speaker is driven by a signal generator. As the frequency is increased less and less people can hear the sound.
154.	C.3.20 Human ear model | Request A large plastic model of the human ear to show the anatomy of it and explain the function of the parts.
155.	C.3.25 Doppler effect | Request An electronic screamer on a rope is spun around or a metal whistle is rotated quickly as it is blown. The periodic up and down shifts in the frequency of the sound is heard.
156.	C.3.30 Inverse square model (sound) | Request A wire pyramid to help to explain the dependence of sound intensity on the distance from the source.
157.	C.3.35 Decibels (camera) | Request A digital sound level meter is used to measure the noise level in the classroom.
158.	C.3.40 Beat box (camera) | Request Sound is produced by a xylophone with six bars tuned at frequencies from 435 Hz to 440 Hz. The beats can be heard by ear or the waves can be visualized on the oscilloscope screen using a microphone.
159.	C.3.45 Speaker interference | Request Four speakers are mounted along a horizontal line on a rod. As the rod is turned around the vertical axis, the audience can hear constructive and destructive interference of the sound waves.
160.	C.3.50 Resonance of a pipe open at both ends | Request When sound is fed through an open pipe, resonance is heard at certain frequencies.
161.	C.3.55 Speed of sound | Request A tuning fork is struck above a tube of water. The height of the water column is adjusted until the fork and tube resonates. From the height of the column and the frequency of the tuning fork the speed of the sound can be calculated.
162.	C.3.60 Organ pipes | Request Several lead organ pipes and tunable wood pipes are used to create sound and demonstrate resonance in a tube.
163.	C.3.65 Breathing helium and heavy gas | Request When you inhale helium, the frequency of your voice increases. If you inhale heavy gas, the frequency decreases.
164.	C.3.70 Monocord | Request Sound is created by the simplest musical instrument, the monocord. As the length of the cord is increased, the frequency decreases. The cord can also be excited in higher oscillation modes.
165.	C.3.75 Stroke rod | Request An aluminium rod is hit with a small hammer at the end. It gives sound only if it is held by two fingers at the nodal points. Otherwise the sound dies off very quickly.
166.	C.3.80 Sympathetic tuning forks | Request Two tuning forks are placed next to each other. When the first fork is struck, the second one starts to oscillate, if it is tuned to the correct frequency. Otherwise remains silent.
167.	C.3.85 Mechanical resonance strips | Request Metal strips of different lengths are driven at varying frequencies to show the relationship between length and fundamental frequency.
168.	C.3.90 Chladni figures | Request Sand is sprinkled on metal plates of various shapes. The plates are set into oscillation by an electromagnet fed by a signal generator. Standing wave patterns are observed as the sand settles at the nodal lines.
169.	C.3.95 Laser modulation for audio transmission (sound) | Request Laser beam is acoustically modulated and then transmitted. When the laser light is received, the audio signal is recovered and amplified to a speaker.
170.	D.1.10 Types of thermometers | Request Several different types of termometers are displayed and their working is explained.
171.	D.1.15 Linear thermal expansion and contraction | Request A straight aluminium pipe is heated by a torch. As it expands, it turn a pointer. If the pipe is cooled by liquid nitrogen, it contracts. The pointer turns in the opposite way.
172.	D.1.20 Bimetallic strip | Request When the bimetallic strip is heated, it bends in one direction. When it is cooled, it bend the other way.
173.	D.1.25 Ball and ring | Request A metal ball fits through a hole in a ring. If the ball is heated or the ring is cooled, it does not fit anymore.
174.	D.1.30 Ice bomb | Request As water freezes to ice and the ice cools down, it expands. The force exerted by the ice is so large, it can break a metal container with thick wall.
175.	D.1.35 Lead bell | Request Lead is not very hard at room temperature. A bell made out of lead does not ring very well. However when it is cooled down by liquid nitrogen, the bell hardens and rings very well.
176.	D.1.40 Specific heat | Request A lead ball is heated to 100 Celsius by placing it in boiling water. It is then placed into room temperature water of equal mass. The temperature of the water rises only very little, about two Celsius degrees.
177.	D.1.45 Melting ice (heat of fusion) | Request Crushed ice floats in water. The temperature of the water ice mixture does not increase until the ice melts completely.
178.	D.1.50 Dropping nails | Request Rods of different metals radiate outward. Nails are attached to the rods with candle wax. As the apparatus is heated at the center, the nails drop. The time it takes for the nails to fall off depends on the heat conductivity of the rods.
179.	D.1.55 Thermal convection in air | Request A box has two vertical glass chimneys. A lit candle is placed under one of the chimneys. When smoke is produced at the top of the other chimney, the convection currents pull the smoke through the box.
180.	D.1.60 Thermal convection in liquids | Request A glass container with glycerol and small particles in it is heated by the projector light and is projected at the same time. The thermal convection of the liquid is observed.
181.	D.1.65 Absorption of radiation | Request A black and a white plate is exposed to the same heat radiation. The temperature of the black plate increases faster than the temperature of the white one.
182.	D.1.70 Transmission of infrared radiation | Request Two concave mirrors face each other. One of the mirrors have an electric heater, the other one has a match at the focal point. After the heater is turned on, the match ignites.
183.	D.2.10 Cold cannon | Request Liquid nitrogen or dry ice is put in a pipe cannon. As the pressure of the gas builds up, the cannon shoots the cork across the lecture hall.
184.	D.2.20 Pressure as a function of temperature | Request A metal sphere containing gas at constant volume is placed in different temperature baths and the resultant pressure is measured. The graph is extrapolated to absolute zero temperature.
185.	D.2.30 Pressure as a function of volume (ohp) | Request A syringe is connected to a pressure gauge. As the syringe is compressed, the pressure of the gas increases. If the pressure is not too far from atmospheric, the pressure volume product is a constant.
186.	D.2.40 Fire syringe | Request Air is compressed very quickly in a piston. The generated heat ignites a small piece of paper.
187.	D.2.50 Energy bike: heat equivalent of work | Request Elecricity is generated by the energy bike, and it is used to heat up water. The electric energy produced is read from the display, and the change in temperature is measured by a thermometer.
188.	D.2.60 Stirling engine | Request A Stirling engine driven by an alcohol burner turning a small propeller.
189.	D.2.70 Low delta T Stirling engine | Request A high precision Stirling engine, which is able to spin from the heat of your hand.
190.	D.2.80 Flame eating engine | Request A small working model of an external combustion engine.
191.	D.3.10 Liquid nitrogen and air balloon | Request An air balloon is placed in a glass beaker and liquid nitrogen is poured on it. The balloon shrinks and becomes deflated. When it warms up to room temperature, it grows back to its original size.
192.	D.3.20 Small and large molecules (video) | Request A short movie about pucks colliding on an air table. Smaller pucks move faster than the larger ones. The motion of the pucks is monitored and the histogram of the velocity distribution is drawn.
193.	D.3.30 Brownian motion (video) | Request A very short movie about the phenomena of Brownian motion.
194.	D.3.40 Crookes radiometer (camera) | Request Four vanes are suspended inside a glass bulb containing vacuum. Each vane has a black and a shiny side. When the radiometer is lit or heated the vanes rotate with the black side away from the source. When the radiometer is cooled it reverses the direction of its rotation.
195.	D.3.50 Maxwell's demon | Request A sealed glass bottle contains black and white balls. When the bottle is spun around the black balls almost always end up at the bottom.
196.	E.1.00 Two types of electric charge (camera) | Request Electric charge is produced by rubbing a glass rod with silk, or an ebonite rod with cat or rabbit fur. The charges are detected with an electroscope or an electrometer.
197.	E.1.04 Van de Graaff generator and wig | Request A wig is placed on the top of the generator. When the generator is turned on, the hair raises.
198.	E.1.08 Wimshurst machine | Request Electric charge is produced by rubbing the rotating plexiglass disks with metal brushes. The charge then can be stored in two Leyden jars for more energetic sparks.
199.	E.1.12 Electric field lines (ohp) | Request Electric field lines for different geometries of charged conductors are displayed with a device containing a thick yellow liquid with tiny particles in it.
200.	E.1.16 Pith balls inside a conducting cylinder (camera) | Request Only the outside pith ball reacts to the charged rod. The pair of pith balls inside the metal cylinder are shielded, they do not feel anything.
201.	E.1.20 Faraday's ice pail (ohp) | Request When charge is placed on a hollow conductor, the charge cannot be found in the inside, but only on the outside.
202.	E.1.24 Faraday cage | Request The wire cage is connected to the Van de Graaff generator. Large sparks are drawn from the cage. However the person sitting inside the cage is protected against electric fields and sparks.
203.	E.1.28 Styrofoam shower | Request Styrofoam chips are placed on the top of the Van de Graaff generator first in a metal then in a plastic container. The chips stay inside the metal container when the generator is turned on, but they fly away from the plastic one.
204.	E.1.32 Electrostatic induction: two charges from one | Request Electric charge is induced on an initially neutral and grounded conductor by approaching it with a charged ebonite or glass rod.
205.	E.1.36 Polarizing water (camera) | Request A narrow stream of water is deflected by a charged ebonite or glass rod placed close to the stream.
206.	E.1.40 Obedient ruler | Request A wood ruler starts spining when it is approached by a charged ebonite or glass rod. This behavior does not change when the wood is covered with aluminium foil.
207.	E.1.44 Dipole models | Request Two models with balls at the end of a straight rod serve as dipole models. One of them has larger charge, the other one has larger distance between the charges.
208.	E.1.48 Electrostatic ping-pong | Request A conducting ping-pong ball bounces back and forth between the plates of a charged capacitor.
209.	E.1.52 Sharp conductor | Request The sharp end of an asymmetric conductor draws sparks more frequently from the Van de Graaff generator than the rounded end.
210.	E.1.56 Electrostatic whirl (camera) | Request A small three armed or a larger two armed metal wheel spins when it is placed on the top of the Van de Graaff generator. The wheels are driven by the intense discharging effect on the top of the sharp peaks.
211.	E.1.60 Cylindrical Gaussian surface model | Request A large cylindrical metal can and a straight rod through it serves as a model of the Gaussian surface in cylindrical problems.
212.	E.1.64 Rubber sheet potential model (camera) | Request Electric potential surface is modeled with an elastic rubber sheet held inside a frame and stretched around a complex geometry.
213.	E.1.68 Parallel plate capacitor | Request The voltage on a parallel plate capacitor is measured as a function of the distance between the plates.
214.	E.1.72 Dielectrics (ohp) | Request Several different kind of dielectric materials are placed between the plates of a charged capacitor. The decrease in voltage is observed.
215.	E.1.76 Dissectable Leyden jar | Request A Leyden jar - as the oldest device to store electric charge - is disassembled and the function of the parts is explained.
216.	E.1.80 Types of capacitors | Request Several different kind of capacitors are displayed and explained.
217.	E.1.84 Big spark | Request A large capacitor is charged up from a battery. When it is discharged with a metal screw driver, it gives a big and loud spark.
218.	E.1.88 Jacob's ladder | Request High voltage in two metal wires generates sparks in the air. As the air heats up within the spark it rises.
219.	E.2.00 Potentiometers | Request Different types of voltmeters are displayed and their function and operation is explained and demonstrated.
220.	E.2.05 Potential along a long wire | Request Constant current is driven through a long straight metal wire. The potential drop at different lengths is measured with a voltmeter.
221.	E.2.10 Ohm's law | Request Ohm's law is demonstrated by applying different voltages on a given resistor and then measuring the current through the resistor.
222.	E.2.15 Series and parallel light bulbs | Request The brightness of the bulbs is observed when the same kind of lightbulbs are connected in series and in parallel.
223.	E.2.20 Power dissipation | Request Current is driven through resistors of different power ratings. The resistor with low power rating overheats and burns out.
224.	E.2.25 Wheatstone bridge | Request Measuring an unknown resistance with the Wheatstone bridge is demonstrated and explained.
225.	E.2.30 Time constant in an RC circuit | Request A large capacitor is charged and then discharged through a light bulb. The change in the brightness of the bulb shows the change of electric current as a function of time.
226.	E.2.35 Marbles and nails model of resistance | Request Marbles roll down on a nail board as a model of electron-flow through a metal crystal.
227.	E.2.40 Resistance versus temperature | Request When a metal wire is heated, its resistance increases. When it is cooled the resistance decreases. The change in resistance is observed when the brightness of the light bulb in series with the wire changes.
228.	E.2.43 Jacob's ladder | Request High voltage between two metal wires generates sparks in the air. Electric current flows through the ionized air and heats it up. The heated spark rises.
229.	E.2.45 Current in molten glass | Request At room temperature glass is a very good insulator. When it is melted, it becomes a conductor lighting up a lightbulb in series with it.
230.	E.2.50 Lemon juice battery | Request Voltage difference is measured, when two different kind of metals are submerged in lemon juice, or sticked in a lemon or other fruits or vegetables.
231.	E.3.00 Compass needle, lodestone, magnets | Request The behavior of a compass needle in Earth's magnetic field is demonstrated. The compass needle is deflected by a loadstone or a magnet.
232.	E.3.04 Earth's magnetic field (model) | Request Iron filings around a small magnetic sphere help to visualize the Earth's magnetic field.
233.	E.3.08 Overhead projector magnetic field lines | Request The magnetic fields of several different magnet arrangements are visualized using iron filings.
234.	E.3.12 Overhead projector compass needles | Request Tiny compass needles in an array line up along the field lines of an external magnetic field. This instrument can also be used to model the behavior of magnetic domains inside a ferromagnet.
235.	E.3.16 Walking the paper clip | Request A paper clip on a thread probes the magnetic field of a big, strong horseshoe magnet.
236.	E.3.20 Oersted's experiment | Request A magnetic needle is deflected when current flows through a straight conductor close to the needle.
237.	E.3.24 Magnetic field from a current | Request The magnetic field of a current flowing though a wire is visualized using iron filings.
238.	E.3.28 Magnetic field of a solenoid | Request The magnetic field of a solenoid is visualized using iron filings.
239.	E.3.32 Picking up nails with a solenoid | Request Nails are picked up by a solenoid with a soft iron core when the current is turned on. The nails are released when the current is turned off.
240.	E.3.36 Jumping wire | Request The force on a current carrying wire in a magnetic field is demonstrated.
241.	E.3.40 Linear engine | Request A straight conductor rod is driven through a magnetic field when current flows through it.