Abstract
SUMMARY.— Transepidermal water loss has been measured at the equilibrium state, i.e. when it reached a constant value at a particular flow rate of dry gas passing over the skin. Measured in this way, transepidermal water loss from the skin is dependent on the rate of flow of the dry gas and the surface area of skin exposed to the flow. Increases in flow rate of dry gas and reduction in the surface area of skin exposed produce corresponding increases in skin water loss. These changes in skin water loss are believed to be due to changes in ambient water vapour pressure within the measuring system. The results are discussed in relation to the possibility of expressing the transepidermal water loss in absolute terms and of measuring the water content of keratin.
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