You know what it looks like… but what is it called?
TAKE THE QUIZ“wet-bulb”
The following 2 entries include the term wet-bulb.
wet-bulb temperature
noun: temperature indicated by a wet-bulb thermometer that is lower than the actual temperature of the air compare psychrometer
wet-bulb thermometer
noun: the thermometer with moistened bulb in a psychrometer
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Merriam-Webster unabridged