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How does an afghan blanket keep you warm when it's full of holes?Labels: interactive, science, trivia
posted by k_sra at 12/06/2005 02:00:00 PM
12.06.2005
How does an afghan blanket keep you warm when it's full of holes?
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Warning: spoiler follows.
Friction. The veolocity of air near a surface is usually near zero. Each loop of afgan slows movement of air past your skin. This helps to slow down heat convective heat transfer, which is usually the prime mode of heat transfer at human temperature ranges in a nicely insulative fluid like air.
World, you're the best. thanks.
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