One slide about Specific humidity is the ratio of water vapor to dry air in a particular mass, and is sometimes referred to as humidity ratio. Specific humidity ratio is expressed as a ratio of grams of water vapor, mv, per kilogram of dry air ma. Удельная влажность - масса водяного пара в граммах на килограмм увлажнённого воздуха [г/кг], то есть отношение масс водяного пара и увлажнённого воздуха. That ratio is defined as: Specific humidity can be expressed in other ways including:
Mixing Ratio The mixing ratio is defined as the mass of water vapor divided by the mass of dry air. -- mixing ratio R – amount of precipitation E – evaporation MR – is a coefficient, that’s why it hasn’t any dimension. Коэффициент увлажнения — отношение годового количества осадков к годовой величине испаряемости для данного ландшафта, является показателем соотношением тепла и влаги.
Relative humidity is a term used to describe the amount of water vapor in a mixture of air and water vapor. It is defined as the ratio of the partial pressure of water vapor in the air-water mixture to the saturated vapor pressure of water at those conditions. f= (eE)*100% * Относительная влажность (f) – отношение фактического давления водяного пара e к давлению насыщения E над плоской поверхностью чистой воды, выраженное в процентах.
Absolute Humidity Absolute humidity is the density of water vapor in the air. It is the mass of water vapor, mw, per cubic meter of total moist air, Vnet: Commonly used unit of absolute humidity is 1 g/m³. Absolute humidity ranges from 0 grams per cubic meter in dry air to 30 grams per cubic meter when the vapor is saturated at 30 °C
Dew point - is the temperature to which a given parcel of humid air must be cooled, at constant barometric pressure, for water vapor to condense into liquid water. The condensed water is called dew when it forms on a solid surface. The dew point is a saturation temperature. a = 17. 271 b = 237. 7 °C Dimension - °C, °K, °F
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MA-275_Humidity 2011.ppt