One way you keep from overheating is by perspiring. Evaporation-a phase change-r

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 C is a somewhat larger 24 × 105J/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 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

Exhaust heat by perspiring,

Q = m h Where, h=24*10^5 J/kg

Q =30(g/min)(1kg/1000g)*(1min/60s)*24*10^5 J/kg

=1200 J/s

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