As the rubber bands are heated up by the heat gun, the polymers making up the rubber band experience an increase in entropy. This causes the rubber band to contract and shorten. As a result, the ...

Ever noticed that a rubber band gets warmer when it’s stretched ... check out [Al Williams] recent article about building a DIY heat pipe.

You will feel a slight warming effect. You can also carry out the reverse process. First, stretch a rubber band and hold it in position for a few seconds. Then quickly release the tension and press ...