dry- and wet-bulb hygrometer

An instrument to measure the dew point, relative humidity, and vapor pressure. It essentially consists of two ordinary, accurate, mercury thermometers. One has thin muslin wrapped around it and is kept wet; it is called a wet-bulb thermometer. The other is a dry-bulb thermometer. The dry-bulb thermometer shows the current temperature, whereas the wet-bulb thermometer shows a somewhat lower temperature, the result of the latent heat of evaporation, which depends on the relative humidity of the air. The difference between the two thermometers is a measure of the relative humidity of the air, which is calculated by a formula. Also called a psychrometer.

Aviation dictionary. 2014.

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  • wet-and-dry-bulb hygrometer — noun A hygrometer consisting of two thermometers, the bulb of one of which is kept wet and shows a lower temperature; the relative humidity is obtained from the two temperatures using tables …   Wiktionary

  • wet-and-dry bulb hygrometer — see hygrometer …   Medical dictionary

  • wet-and-dry bulb hygrometer — see hygrometer …   The new mediacal dictionary

  • wet-and-dry bulb hygrometer — noun → psychrometer …   Australian English dictionary

  • Wet Bulb Globe Temperature — The Wet Bulb Globe Temperature (WBGT) is a composite temperature used to estimate the effect of temperature, humidity, and solar radiation on humans. It is used by industrial hygienists, athletes, and the military to determine appropriate… …   Wikipedia

  • Психрометр (Wet-And-Dry Bulb Hygrometer) — см. Гигрометр. Источник: Медицинский словарь …   Медицинские термины

  • Hygrometer — Not to be confused with hydrometer. A hygrometer (UK: /haɪˈɡrɒmɪtə/) is an instrument used for measuring the moisture content in the environmental air, or humidity. Most measurement devices usually rely on measurements of some other quantity …   Wikipedia

  • hygrometer — /huy grom i teuhr/, n. any instrument for measuring the water vapor content of the atmosphere. [1660 70; HYGRO + METER] * * * ▪ meteorological instrument       instrument used in meteorological science to measure the humidity, or amount of water… …   Universalium

  • Dry-bulb temperature — The dry bulb temperature is the temperature of air measured by a thermometer freely exposed to the air but shielded from radiation and moisture. Dry bulb temperature is the temperature that is usually thought of as air temperature, and it is the… …   Wikipedia

  • hygrometer — Any device for measuring the water vapor in the atmosphere, usually indicating relative humidity directly. [hygro + G. metron, measure] * * * hy·grom·e·ter hī gräm ət ər n any of several instruments for measuring the humidity of the atmosphere *… …   Medical dictionary

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