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Equations for the determination of humidity from dewpoint and psychrometric dataA general expression based on the Claperon-Clausius differential equation that relates saturation vapor pressure, absolute temperature, and the latent heat of transformation was derived that expresses saturation vapor pressure as a function of absolute temperature. This expression was then used to derive general expressions for vapor pressure, absolute humidity, and relative humidity as functions of either dewpoint and ambient temperature or psychrometric parameters. Constants for all general expressions were then evaluated to give specific expressions in both the international system of units and U.S. customary units for temperatures above and below freezing.
Document ID
19770009916
Document Type
Other - NASA Technical Note (TN)
Authors
Parish, O. O. (NASA Hugh L. Dryden Flight Research Center Edwards, CA, United States)
Putnam, T. W. (NASA Hugh L. Dryden Flight Research Center Edwards, CA, United States)
Date Acquired
September 3, 2013
Publication Date
January 1, 1977
Subject Category
PHYSICS (GENERAL)
Report/Patent Number
NASA-TN-D-8401
H-937
Funding Number(s)
PROJECT: RTOP 505-11-26
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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