Kirchhoff's equation

From Glossary of Meteorology
A relation that equates the variation with temperature of the latent heat of a phase change to the difference between the specific heats of the two phases.
For the heat of vaporization this may be written as
ams2001glos-Ke6
where Lv is the latent heat of vaporization, cpv is the specific heat at constant pressure of water vapor, and cw is the specific heat of liquid water.
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