You are lying on the beach on a hot day, neither gaining nor losing energy throu

Question

You are lying on the beach on a hot day, neither gaining nor losing energy through conduction with the air. The energy your body gains from sunshine is counteracted by energy given off by evaporation of perspiration.
- Suppose sunlight with intensity I (in watts/m2) shines directly upon an area A of exposed skin and that you can cool your body through evaporation (sweating). The energy to evaporate the water (sweat) is mLvap. Derive an equation for the mass of water you must sweat each hour to maintain a constant body temperature.

Explanation / Answer

m = I * A * 1hr/Lvap

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