Materials Required:
l Heavy-duty rubber band, at least ¼ inch wide
Procedure:
- Hold the rubber band between your two hands and stretch it tightly. Gently place it against your cheek. The rubber band feels warm.
- Now release the tension in the rubber band, and once again hold it to your face. This time it is cool. Repeat the stretching and loosening process several times. Do you know what causes the gain and loss of heat?
This Is What Happens:
If you could not come up with an explanation for this experiment, don’t worry. Scientists have several theories, but no one is sure which is absolutely correct! One idea is that when the rubber is stretched, the molecules bump into each other more frequently and this may raise the temperature.
