GPHY 209 Lecture Notes - Lecture 6: Vapor Pressure, Humidity, Mixing Ratio
26 Nov 2017
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Gphy 209 week 4 lecture 2: atmospheric moisture. Saturation: when the amount of water vapor above a surface is enough for the rates of condensation and evaporation to become equal, saturation occurs, at saturation, evaporation and condensation rates are equal. Measuring water vapor: vapor pressure: the part of the total atmospheric pressure that is due to water vapor, depends on, temperature, density of water vapor molecules (most important) Is an expression of the maximum vapor that can exist. Sling psychrometer: dry bulb- measures ambient air temperature, wet bulb- measures temperature to which air is cooled by evaporation, more evaporation from the wet bubble (due to drier air), more cooling on the wet bulb thermometer. How can you get saturation: add water vapor, lower the temperature to the dew point, mix cold air with warm moist air (most common) *saturation is a balance between condensation and evaporation.
