pszichrométeri
A pszichrométer, also known as a psychrometer, is an instrument used for measuring atmospheric humidity. It typically consists of two thermometers, a dry-bulb thermometer and a wet-bulb thermometer, mounted side-by-side. The dry-bulb thermometer measures the ambient air temperature. The wet-bulb thermometer has its bulb covered with a wick that is kept moist with distilled water.
When air moves over the wet wick, evaporation occurs. The rate of evaporation, and thus the cooling
By comparing the readings of the dry-bulb and wet-bulb thermometers, one can determine the relative humidity