specific humidity


specific humidity
the ratio of the mass of water vapor in air to the total mass of the mixture of air and water vapor. Cf. mixing ratio, absolute humidity, dew point, relative humidity.

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      mass of water vapour in a unit mass of moist air, usually expressed as grams of vapour per kilogram of air, or, in air conditioning, as grains per pound. The specific humidity is an extremely useful quantity in meteorology. For example, the rate of evaporation of water from any surface is directly proportional to the specific humidity difference between the surface and the adjoining air.

      Furthermore, the specific humidity does not vary as the temperature or pressure of a body of air changes, as long as moisture is not added to or taken away from it. (Certain other indices of humidity are sensitive to the pressure and temperature.) This stability of the specific humidity makes it useful as an identifying property of a moving air mass. The specific humidity of saturated air (i.e., that in equilibrium with a vapour source, either water or ice) increases rapidly with increasing temperature.

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Universalium. 2010.

Look at other dictionaries:

  • specific humidity — drėgnis statusas T sritis chemija apibrėžtis Drėgmės ir ją sugėrusios ar turinčios medžiagos masės arba tūrio santykis. atitikmenys: angl. humidity ratio; moisture content; moisture load; specific humidity rus. влагосодержание; удельная влажность …   Chemijos terminų aiškinamasis žodynas

  • specific humidity — savitasis oro drėgnis statusas T sritis chemija apibrėžtis Tam tikrame drėgno oro tūryje esančios vandens garų masės ir visos to oro masės dalmuo. atitikmenys: angl. humidity ratio; specific humidity rus. удельная влажность воздуха …   Chemijos terminų aiškinamasis žodynas

  • specific humidity — savitoji drėgmė statusas T sritis fizika atitikmenys: angl. specific humidity vok. spezifische Feuchte, f; spezifische Feuchtigkeit, f rus. удельная влажность, f pranc. humidité spécifique, f …   Fizikos terminų žodynas

  • specific humidity — noun : the mass of water vapor per unit mass of moist air * * * the ratio of the mass of water vapor in air to the total mass of the mixture of air and water vapor. Cf. mixing ratio, absolute humidity, dew point, relative humidity …   Useful english dictionary

  • specific humidity — noun The ratio of the mass of water vapour to mass of air …   Wiktionary

  • specific humidity — amount of water vapor that one cubic centimeter of air can absorb …   English contemporary dictionary

  • specific humidity — The weight of water vapor per unit weight of moist air (e.g., grams of water vapor per kilogram of air) …   Aviation dictionary

  • Specific Humidity —   The weight of water vapor, per unit weight of dry air …   Energy terms

  • Humidity — is the amount of water vapor in the air. In daily language the term humidity is normally taken to mean relative humidity. Relative humidity is defined as the ratio of the partial pressure of water vapor in a parcel of air to the saturated vapor… …   Wikipedia

  • humidity ratio — drėgnis statusas T sritis chemija apibrėžtis Drėgmės ir ją sugėrusios ar turinčios medžiagos masės arba tūrio santykis. atitikmenys: angl. humidity ratio; moisture content; moisture load; specific humidity rus. влагосодержание; удельная влажность …   Chemijos terminų aiškinamasis žodynas


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