GEOG 2110L Lecture Notes - Vapor Pressure, Water Vapor, Humidity
17 Mar 2014
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Document Summary
Hydrologic cycle: the continuous movement of water from the earth"s surface to the atmosphere and back to the surface, then to the atmosphere, * basic process: evaporation & transpiration (evapotranspiration), condensation, precipitation, runoff. * transpiration: the water absorbed by vegetation & then vegetation then released to the atmosphere. Humidity: the water vapor content of the air. ** the amount of water vapor in the air can be measured in different ways or units: * specific humidity: grams of water (h2o)/ kilograms (kg) of air. * absolute humidity: grams of water (h2o)/ cubic meter (m3) of air. * relative humidity (rh): the ratio of water vapor actually in the air compared to the maximum water vapor the air could hold at that temperature and expressed as a percentage. Ex: (conent / capacity) x 100 = rh. * partial pressure: each component of the atmosphere makes up a part of the total air pressure.
