psychrometric formula [¦sī·krə¦me·trik ′fȯr·myə·lə]
Psychrometric Formula
(thermodynamics)
The semiempirical relation giving the vapor pressure in terms of the barometer and psychrometer readings.
Psychrometric Formula
a relationship that permits a determination of vapor pressure from the readings of dry-bulb and wet-bulb thermometers. Mathematically, it is expressed as e = E – AP(t – tw), where e is the vapor pressure in the air, E is the saturation vapor pressure at temperature tw of
Figure 1. Dependence of the psychrometer constant A on the velocity of air flow past the thermometer bulb
the wet-bulb thermometer, t is the air temperature, P is the atmospheric pressure, and A is the psychrometer constant, which depends on the design of the psychrometer and, in a more direct way, on the velocity of air flow past the thermometer bulb (see Figure 1).
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