4E10.20 - Balloon in Liquid Nitrogen
Demonstrate the effect that cold temperatures have on gas molecules.
InstructionsAn air-filled balloon is placed inside a dewar of liquid nitrogen. After a couple of seconds the balloon is pulled out with a pair of clamps and placed on the lecture bench. The balloon will look like all the air has gone out of it. The students can then watch as the balloon slowly grows while the air inside heats up to room temperature.