THE evaporation of water from the skin and the respiratory tract is an important mechanism of heat loss in homeotherms, and man's ability to sweat is essential for his survival when the temperature of the environment approaches or exceeds body temperature. The transfer of latent heat from an animal to its environment is often estimated by multiplying the loss in weight attributable to evaporation by the latent heat of vaporization of water, λ, which decreases from 2,501 J/g at 0° C to 2,406 J/g at 40° C.
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MONTEITH, J. Latent Heat of Vaporization in Thermal Physiology. Nature New Biology 236, 96 (1972). https://doi.org/10.1038/newbio236096a0