Transepidermal water loss

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Transepidermal Water Loss (TEWL) is a term associated with dermatology and connected sciences.

It is defined as the measurement of the quantity of water that passes from inside a body (animal or plant) through the epidermal layer (skin) to the surrounding atmosphere via diffusion and evaporation processes. A human can lose a maximum of 2L/hr through this route aka sweating. The autonomic nervous system, body temperature, and blood flow to the skin control the amount of TEWL.


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