Then, as you browse the listings, simply check the boxes corresponding to the demos you would like. When removed from the liquid nitrogen the balloon regains its former size. After a few minutes of heating, iron is hot but an equal weight of water is cool, which is shown by dipping fingers into the water and sprinkling a few drops on the iron, where the water sizzles.
Thermal expansion causes a brass blade to oscillate, producing an audible note.
Gas build-up will shoot a cork across the lecture hall. A glass enclosed box has two vertical glass chimneys. A lit candle is placed beneath one chimney. When smoke is placed at the top of the other chimney, convection currents pull the smoke through the box. A constant volume of gas is placed in different temperature baths and the resultant pressures noted.