How much solar flux absorb by earth's surface is used to drive hydrologic cycle:
Correct answer: B. 1/3rd
- A. 1/2sec
- B. 1/3rd
- C. 1/4th
- D. 1/5th
Explanation
A commonly quoted estimate is that about one-third of the solar energy absorbed at Earth's surface drives evaporation, which powers the hydrologic cycle. The likely trap is one-fourth, which may be confused with other approximate fractions in Earth's energy budget.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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