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A rough measurement shows that the surface area of one arm is about 1.7 times that of my head. So the rate of heat loss from my head will be around 1/3 that from both arms - quite significant. But ...
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A rough measurement shows that the surface area of one arm is about 1.7 times that of my head. So the rate of heat loss from my head will be around 1/3 that from both arms - quite significant. But ...