Transcription of 3. EVAPORATION - GitHub Pages
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3. EVAPORATION - GitHub Pages
EVAPORATION 49 _____ . 3. EVAPORATION EVAPORATION occurs when water is converted into water vapor at the evaporating surface, the contact between water body and overlapping air. At the evaporative surface, there is a continuous exchange of liquid water molecule into water vapor & vice versa. The two main factors influencing EVAPORATION from an open water surface are the supply of energy to provide the latent heat of vaporization, and the ability to transport the vapor away from the evaporative surface. The latent heat of vaporization lv is the amount of heat absorbed by a unit mass of a substance. Solar radiation is the main source of heat energy. The magnitude of annual EVAPORATION is highly dependent on the prevailing climate in and around the water body.
Figure 3.1 Saturated vapor pressure as a function of temperature over water. Point C has vapor pressure e and temperature T, for which the saturated vapor pressure e s. The temperature at which the air is saturated for vapor pressure e is the dew-point temperature T d. Figure 3.1 shows the saturation vapor pressure curve and the T d and T, e s
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