Rubber Band Contraction During Heating
To demonstrate that rubber contracts when heated.
Long rubber band (in refrigerator), 500g mass, stand, and heat gun.
A 500 gram mass hangs from a rubber band which is connected to a rigid support. Using the heat gun, apply heat to the entire length of the rubber band, causing it to contract and pull up the weight.
J. B. Brown, Thermodynamics of a Rubber Band, AJP 31, 397 (1963).