Abstract
A thermal conductivity cell has been applied as a humidity sensor in the determination of the insensible perspiration of 2 cm2 human forearm skin. The cell has been calibrated with the use of dried and of humid air from the surrounding atmosphere, resulting in very much the same values. If humid environmental air is used as a carrier gas, the skin need not be conditioned and the time needed for measuring the water vapor loss of human skin is only 1/5 of the time needed when methods with a dried gas are applied.

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