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Q: Why does wind make you colder, but re-entry makes you hotter?
The original question was:Why is it that, when you are outdoors and the atmosphere is moving past you at a moderate rate (wind), you get colder; but when the atmosphere is moving past a space shuttle during re-entry, it gets hotter? The greater the air speed, the more shearing the air near our bodies is, and the thinner the layer of roughly-stationary-air. So more wind means less insulation, which makes you colder. The rush of air moving past the shuttle does cool it off, but the effect is completely overwhelmed by the effect of the compression. Below Mach 1 air will just get out of the way rather than compress much, but above Mach 1 you can basically “sneak up” on the air.
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