“relative humidity”的概念、定义、翻译、参考文献-科学参考

relative humidity

Physics

See humidity.

Chemical Engineering

The moisture content of dry air expressed as a percentage. This corresponds to the ratio of the mass of water vapour in a given volume of air at a given temperature and pressure, to the maximum quantity of water vapour that can be held in the air at those conditions.

Geology and Earth Sciences

The water-vapour content of air at a given temperature, expressed as a percentage of the water-vapour content that would be required for saturation at that temperature. Generally the relative humidity decreases during the day, with increase in temperature, and increases at night as the temperature falls.

Geography

The ratio of the actual vapour density (which indicates the amount of water vapour present in the air) to the theoretical maximum (saturation) vapour density at the same temperature, expressed as a percentage. This may be expressed as:
$U = 100 e / e_{w}^{´}$
where e is actual vapour pressure and e´_w saturation vapour pressure with respect to water at the same temperature.
Saturated air has a relative humidity of 100%. Air with a relative humidity in excess of 100% is said to be supersaturated. Relative humidity varies both diurnally, with a dawn maximum and an afternoon minimum (Priante-Filho et al. (2004) Glob. Change Biol. 10, 5), and, less conspicuously, annually, both variations being in opposition to the pattern of temperatures.

单词	relative humidity
释义	relative humidity Physics See humidity. Chemical Engineering The moisture content of dry air expressed as a percentage. This corresponds to the ratio of the mass of water vapour in a given volume of air at a given temperature and pressure, to the maximum quantity of water vapour that can be held in the air at those conditions. Geology and Earth Sciences The water-vapour content of air at a given temperature, expressed as a percentage of the water-vapour content that would be required for saturation at that temperature. Generally the relative humidity decreases during the day, with increase in temperature, and increases at night as the temperature falls. Geography The ratio of the actual vapour density (which indicates the amount of water vapour present in the air) to the theoretical maximum (saturation) vapour density at the same temperature, expressed as a percentage. This may be expressed as: $U = 100 e / e_{w}^{´}$ where e is actual vapour pressure and e´_w saturation vapour pressure with respect to water at the same temperature. Saturated air has a relative humidity of 100%. Air with a relative humidity in excess of 100% is said to be supersaturated. Relative humidity varies both diurnally, with a dawn maximum and an afternoon minimum (Priante-Filho et al. (2004) Glob. Change Biol. 10, 5), and, less conspicuously, annually, both variations being in opposition to the pattern of temperatures.
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