One way you keep from overheating is by perspiring. Evaporation -a phase change-
ID: 2110896 • Letter: O
Question
One way you keep from overheating is by perspiring. Evaporation -a phase change- requires heat, and the heat energy is removed from your body. Evaporation is much like boiling, only water's heat of vaporization at 35.0 deg C is a somewhat larger 24*10^5 J/kg because at lower temperatures more energy is required to break the molecular bonds. Very strenuous activity can cause an adult human to produce 30.0 g of perspiration per minute.
If all the perspiration evaporates, rather than dripping off, at what rate (in J/s) is it possible to exhaust heat by perspiring?
Explanation / Answer
energy per minute = 0.03*24*10^5 = 72 kJ/min = 1200 J/s
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