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Applied Hydrogeology

by C. W. Fetter
Fourth Edition, Prentice Hall, New Jersey, 2001

Chapter 2: Elements of the Hydrologic Cycle


"Water molecules are continually being exchanged between liquid and atmospheric water vapor. If the number passing to the vapor state exceeds the number joining the liquid, the result is evaporation. When water passes from the liquid to the vapor state, it will absorb 590 cal of heat from the evaporative surface for every gram of water evaporated. The vapor pressure of the liquid is directly proportional to the temperature. Evaporation will proceed until the air becomes saturated with moisture. The absolute humidity of a given air mass is the number of grams of water per cubic meter of air."

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