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Peter Hook | 13:41 Sat 10th Mar 2001 | How it Works
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Why do we blow on our hands in Winter to warm them but blow on a cup of tea to cool it? Surely our breath cannot have it both ways?
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Avatar Image Henryn
When you blow on a hot drink, you blow away the heat that has risen to the surface to help cool the drink down quicker. When you blow on your hands in winter,your exhaled air is warmer than outside air and so heats up your hands temporarily.
22:52 Sun 11th Mar 2001
Avatar Image Toonwatcher
When you blow on a liquid such as hot tea you are actually helping the liquid to vapourise by blowing away molecules, preventing them returning to the body of the liqued. Vapourisation takes a great deal of energy (heat) so the drink cools.
11:13 Wed 21st Mar 2001

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