Wet-bulb temperature
Temperature of a thermometer covered by moist cloth
Wet-bulb temperature
The wet-bulb temperature is the lowest temperature that can be reached by the evaporation of water under current ambient conditions. It combines humidity and temperature to better reflect heat stress on humans, as the body's ability to cool itself through sweating is reduced at higher humidity. At 100% relative humidity, wet-bulb temperature is equal to air temperature, or dry-bulb temperature. At lower humidity, the wet-bulb temperature is lower than dry-bulb temperature due to evaporative cooling. Wet-bulb temperature is formally defined as the temperature of a parcel of air cooled adiabatically to saturation (100% relative humidity) by the evaporation of water into it, with all latent heat supplied by the parcel. Wet-bulb temperature can be measured using a wet-bulb thermometer, such as in a psychrometer.
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