Experience teaches us that a large balloon takes longer to deflate than a small one of the same kind. But what is the quantitative relation between the deflation time τ and the radius R of a balloon? A simple analysis, depending only upon elementary physics, shows that —a prediction that is surprisingly easy to illustrate with a party balloon, a tape measure, and a smart-phone app.
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See the webpage <https://www.bubblexl.com/english/big-round-balloon-240-cm-8-blue.htm>.
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