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relative humidity
relative humidityn. The ratio of the amount of water vapor in the air at a specific temperature to the maximum amount that the air could hold at that temperature, expressed as a percentage.relative humidity n (General Physics) the mass of water vapour present in the air expressed as a percentage of the mass that would be present in an equal volume of saturated air at the same temperature. Compare absolute humidity rel′ative humid′ity
n. the amount of water vapor in the air, expressed as a percentage of the maximum amount that the air could hold at the given temperature. [1810–20] rel·a·tive humidity (rĕl′ə-tĭv) The ratio of the actual amount of water vapor present in the air at a given temperature to the maximum amount that the air could hold at that temperature. Relative humidity is expressed as a percentage. Compare absolute humidity.relative humidityA percentage scale to measure the level of humidity in the atmosphere: from 0% which indicates the air is absolutely dry to 100% which indicates the air is saturated.Thesaurus| Noun | 1. |  relative humidity - the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperature; expressed as a percentageratio - the relative magnitudes of two quantities (usually expressed as a quotient) |
relative humidity
relative humidity[′rel·əd·iv hyü′mid·əd·ē] (meteorology) The (dimensionless) ratio of the actual vapor pressure of the air to the saturation vapor pressure. Abbreviated RH. Relative humidityThe ratio of the amount of water vapor in air to the maximum amount of water that the same volume of air can hold at the same temperature, expressed as a percentage.relative humidityThe ratio of the weight of water vapor actually in humid air to the maximum possible weight of the water vapor that the air could contain at the same temperature; usually expressed as a percentage.relative humidityThe ratio of the amount of water vapor in the air to the amount the air can hold at that temperature. This ratio is always expressed as a percentage.relative humidity
humidity [hu-mid´ĭ-te] the degree of moisture in the air.absolute humidity the actual amount of vapor in the atmosphere, expressed in milligrams per liter.relative humidity the percentage of moisture in the air as compared to the amount necessary to cause saturation, which is taken as 100.humidity therapy the therapeutic use of water to prevent or correct a moisture deficit in the respiratory tract. Under normal conditions the respiratory tract is kept moist by humidifying mechanisms that allow for evaporation of water from the respiratory mucosa. If these mechanisms fail to work, are bypassed (such as with an endotracheal tube), or are inadequate to overcome the drying and irritating effects of therapeutic gases and mucosal crusting, some form of humidification must be provided.
The principal reasons for employing humidity therapy are: (1) to prevent drying and irritation of the respiratory mucosa, (2) to facilitate ventilation and diffusion of oxygen and other therapeutic gases being administered, and (3) to aid in the removal of thick and viscous secretions that obstruct the air passages. Another important use of water aerosol therapy is to aid in obtaining an induced sputum specimen.
Humidity therapy may be delivered in a variety of ways. Humidifiers and vaporizers increase the water content of an environment and are limited to the treatment of upper respiratory disorders because they produce particles that are too large to penetrate deeply into the lungs. Nebulizers generate clouds or mists of particles that are extremely small and thus capable of penetrating more deeply into the bronchioles and small structures of the lower respiratory tract. Examples of these include jet instruments and ultrasonic nebulizers.rel·a·tive hu·mid·i·tythe actual amount of water vapor present in the air or in a gas, divided by the amount necessary for saturation at the same temperature and pressure; expressed as a percentage.rel·a·tive hu·mid·i·ty (rel'ă-tiv hyū-mid'i-tē) The actual amount of water vapor present in the air or in a gas, divided by the amount necessary for saturation at the same temperature and pressure; expressed as a percentage. rel·a·tive hu·mid·i·ty (rel'ă-tiv hyū-mid'i-tē) Actual amount of water vapor present in air or gas, divided by amount necessary for saturation at same temperature and pressure; expressed as a percentage. FinancialSeeRSee RHY
See RHYrelative humidity
Related to relative humidity: absolute humidity, dew pointWords related to relative humiditynoun the ratio of the amount of water in the air at a give temperature to the maximum amount it could hold at that temperatureRelated Words |