As recommended by Alduchov and Eskridge, the value of these are: a = 17.625 and b = 243.04 ☌ and RH - Relative humidity of the air (in percent).The dew point is calculated according to the following formula: Lawrence from 2005) that allows us to obtain accurate results (with an uncertainty of 0.35 ☌) for temperatures ranging from -45 ☌ to 60 ☌. This dew point calculator uses the Magnus-Tetens formula ( based on the article by Mark G. Many equations describing this relationship have been formed. ![]() ![]() It is merely the water content in the air, expressed in grams per cubic meter:Ībsolute humidity = m / V, where m is the mass of water vapor, and V is the volume of the air and water vapor mixture.įor saturated air at 30 ☌ (86 ☏), the absolute humidity in the atmosphere ranges from ~0 to 30 grams per cubic meter.ĭid you notice that the formulas don't take the temperature into consideration? To understand this definition, you also need to know the meaning of absolute humidity. Or, expressed differently, the relative humidity is the ratio of the water vapor pressure Pw to the saturation water vapor pressure Pws at the given temperature: Relative humidity = 100% × current absolute humidity / max absolute humidity In other words, it's the amount of moisture in the air compared to what the air can maximally "hold" at that temperature: It is the ratio of the current absolute humidity to the maximum absolute humidity possible for the current temperature. Relative humidity is expressed as a percentage.
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