Psychrometric constant

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psychrometric constant

The ratio of specific heat (Cp) of moist air at constant pressure to latent heat (Lv) of vaporization of water.

This constant has a value of γ = Cp/Lv ≅ 0.4 (gwater/kgair) K-1. Latent heat flux, when multiplied by this constant, yields a moisture flux.

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