wet bulb

wet bulb
wet bulb,
the one of the two thermometers of a psychrometer whose bulb is kept moistened during the period when humidity determinations are being made.

* * *

n. one of the two thermometers of a psychrometer, the bulb of which is enclosed in wetted material so that water is constantly evaporating from it and cooling the bulb

Useful english dictionary. 2012.

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