Psychrometer (wet- and dry-bulb hygrometer)
- Hygrometer using evaporative cooling as a measure of humidity.
- Consists of two thermometers, one of these has a dry bulb, and the bulb of the second is kept wet.
- Evaporation at the wet bulb lowers the temperature so this thermometer usually displays a lower temperature.
- Dry-bulb temperature represents the measured air temperature
- The paired temperature values can be used to find the humidity using tables or by calculation (sometimes internally calculated and displayed directly by modern psychrometers).
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