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The Goff-Gratch equation is one (arguably the first reliable) amongst many equations that have been proposed to estimate the saturation water vapor pressure at a given temperature. All such equations remain approximations, however.
Additional recommended knowledge
Another similar equation based on more recent data is the Arden Buck Equation
This equation is named after the authors of the original scientific article who described how to calculate the saturation water vapor pressure above a flat free water surface as a function of temperature (Goff and Gratch, 1946). Goff (1957) later revised his formula, and the latter was recommended for use by the World Meteorological Organization in 1988, with further corrections in 2000.
The original Goff-Gratch (1946) equation reads as follows:
Similarly, the equation for the saturation water vapor pressure over ice is:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Goff-Gratch_equation". A list of authors is available in Wikipedia.|