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Blow up 2 balloons the same size and tie them- use a saucepan to measure
the balloons: they are the same size when they touch the pot's sides. |
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Tape each balloon to the end of the dowel. |
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Balance the dowel on a pencil supported by 2 cans. |
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Mark the balance point on the dowel. |
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Next, put one balloon in a cold place- refrigerator, ice chest with ice. |
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Put the other in a warm place. |
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Let some air out of the warm balloon and blow some air into the cold balloon
so that they are the same size. |
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Balance them again. |
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