How Do You Measure Humidity Using A Psychrometer?
A hygrometer is a meteorological instrument that measures relative humidity. Relative humidity is a ratio of the partial pressure of water vapor in the air to the partial pressure if the water vapor was concentrated enough to begin condensing, i.e. experience a phase change to liquid. The simplest type of hygrometer is a sling psychrometer. Its use is also called the “wet-dry method,” because one of the two thermometers of the psychrometer has wet cloth on its bulb to simulate water vapor saturation. Moisten the cloth over the wet-bulb thermometer. The psychrometer will come with a cloth attached, covering the mercury-filled bulb of one of the two thermometers. Swing the two thermometers for about five minutes to capture the ambient temperature and to give water on the wet bulb time to evaporate. The temperature of the wet-bulb thermometer will drop as the evaporation occurs. Use the built-in slide scale to enter the wet- and dry-bulb temperature readings. The arrow of the scale will p
