Experiment Ha-07

Ball and Ring

Description: A ball and ring are constructed so that at room temperature the ball passes through the ring easily. The ball is then heated for about 10 seconds in the flame from the propane torch, and the ball can no longer pass through the ring. Video clips of this experiment are available: .avi (Windows) and .mov (Mac).


Ring (left) and ball (right).





This experiment involves fire. Know where the classroom fire extinguishers are located before performing the experiment and be cautious with flame. Use wooden handles to handle the ball and ring and let them cool before touching the metal. Extinguish matches in water.


Materials: ball and ring, propane torch, matches


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This page was last updated on Friday August 15, 2008 8:37 PM