GEOG 1290 Lecture Notes - Lecture 19: Evaporation, Dew Point, Evapotranspiration
29 Nov 2014
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Document Summary
Properties of water vapor: colourless, odorless, invisible, air feels sticky. Evaporation: warmer temperatures evaporate more water, windiness reduces evaporation, evapotranspiration. Humidity: amount of water vapor in air. Relative humidity: expressed as , expresses actual amount of water vapor as percentage of maximum amount of water vapor the air can hold at certain temperature. Saturation depends on temperature: rh: actual water vapor in air/capacity x 100. Capacity: maximum, saturation, specific humidity: at 100%, relative humidity is saturated. Air brought to saturation by decreasing the temperature (no water vapor added: changing temperature: Cool to dew point: cool to dew point rh = 100% Rh lowest in midafternoon and highest just before dawn. Related humidity concepts: dew point temperature. Temperature of an air mass at which the air holds its full capacity of water. Critical air temperature at which saturation is reached (condensation begins) 100% rh = dew point temperature: sensible temperature. Temperature as it feels to a person"s body.
