Thus we can express mass to volume ratio as Where R is the universal gas constant defined as 8313.6, and Rv is the specific gas constant for water vapor defined as 461.5 Then we can use the general law of perfect gases Thanks to the World Meteorological Organization, we can find saturation vapor pressure given the temperature and atmospheric pressure (read more at Saturation vapor pressure)įrom the relative humidity and saturation vapor pressure, we can find the actual vapor pressure. It is a measure of the actual water vapor content of the air. The mass of water vapor in a unit volume of air. other accessories demo in the picture is not included, Item Type: Anti-theft Clasp with Matching Screws,Function: bedroom installation/vertical installation. The ratio of the actual amount of water vapor in the air to the amount it could hold when saturated is expressed as a percentage, or the ratio of the actual vapor pressure to the saturation vapor pressure is expressed as a percentage. Temperature Units The temperature units to use for all temperature parameters including sample temperature, dew-point, frost-point and wet bulb. Sample Temperature The temperature at the point where the humidity measurement is made. To follow, are a couple of definitions, taken from the Australian bureau of meteorology Weight Molecular weight of gas being measured, used only for ppmW/Mixing Ratio calculations.
First, it is helpful to define relative and absolute humidity.
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