I believe a psychrometer operates on the same principle. "A psychrometer, or a wet and dry-bulb thermometer, consists of two calibrated thermometers, one that

I believe a psychrometer operates on the same principle. "A psychrometer, or a wet and dry-bulb thermometer, consists of two calibrated thermometers, one that is dry and one that is kept moist with distilled water on a sock or wick. At temperatures above the freezing point of water, evaporation of water from the wick lowers the temperature, such that the wet-bulb thermometer will be at a lower temperature than that of the dry-bulb thermometer. " https://en.wikipedia.org/wiki/Hygrometer https://en.wikipedia.org/wiki/Hygrometer The psychrometer just compares the wet and dry bulb temperatures to arrive at a relative-humidity value. I.e., it still operates on the principle of a wet-bulb thermometer.