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psychrometer

psychrometer (sīkrŏm´Ĭtər), one of many instruments used for measuring the water vapor content or relative humidity of the atmosphere. It consists of two identical thermometers—the wet-bulb thermometer, so called because its bulb is covered with a jacket of tight-fitting muslin cloth that can be saturated with distilled water; and the dry-bulb thermometer. When the cloth is soaked and the thermometers are properly ventilated, the wet-bulb temperature will be lower than the dry-bulb temperature (actual air temperature) because of cooling due to the evaporation of water from the cloth. The drier the air is, the greater the evaporation and thus the more the wet-bulb temperature is depressed. Psychrometric tables list various humidity variables, such as relative humidity, according to dry-bulb temperature and wet-bulb depression at equilibrium. Ventilation is provided by whirling the thermometers at the end of a chain (sling psychrometer) or by a suction fan (aspiration psychrometer). Newer psychrometers use special electronic sensors. See hygrometer.

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"psychrometer." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 27 Mar. 2017 <http://www.encyclopedia.com>.

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"psychrometer." The Columbia Encyclopedia, 6th ed.. . Retrieved March 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/psychrometer

psychrometer

psychrometer A hygrometer that has a wet-bulb and a dry-bulb thermometer. See also whirling psychrometer.

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"psychrometer." A Dictionary of Ecology. . Encyclopedia.com. 27 Mar. 2017 <http://www.encyclopedia.com>.

"psychrometer." A Dictionary of Ecology. . Encyclopedia.com. (March 27, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/psychrometer-0

"psychrometer." A Dictionary of Ecology. . Retrieved March 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/psychrometer-0

psychrometer

psychrometer Hygrometer with a wet-bulb and a dry-bulb thermometer. See also WHIRLING PSYCHROMETER.

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"psychrometer." A Dictionary of Earth Sciences. . Encyclopedia.com. 27 Mar. 2017 <http://www.encyclopedia.com>.

"psychrometer." A Dictionary of Earth Sciences. . Encyclopedia.com. (March 27, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/psychrometer

"psychrometer." A Dictionary of Earth Sciences. . Retrieved March 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/psychrometer