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The psychrometric constant, γ = , ralates the partial pressure of water in air to the air temperature. This lets one interpolate actual vapor pressure from paired dry and wet thermometer bulb temperature readings.
Additional recommended knowledge
Although is constant, varied air composition results in varied .
Thus on average, at a given location or altitude, the psychrometric constant is approximately constant. Still, it is worth remembering that weather impacts both atmospheric pressure and composition.
vapor pressure estimation
Saturated vapor pressure,
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Psychrometric_constant". A list of authors is available in Wikipedia.|