absolute humidity


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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.

ab·so·lute hu·mid·i·ty

the mass of water vapor actually present per unit volume of gas or air.

absolute humidity

the actual mass or content of water in a measured volume of air. It is usually expressed in grams per cubic meter or pounds per cubic foot or cubic yard.

ab·so·lute hu·mid·i·ty

(ab'sŏ-lūt' hyū-mid'i-tē)
The mass of water vapor actually present per unit volume of gas or air.
References in periodicals archive ?
Based on preliminary analyses that indicated several predictors could be important for predicting activity, the CALL data set included an additional model composed of absolute humidity, wind speed and presence/absence of Houston toad CALL activity on the previous night as predictors, and the MOVE data set included an additional model composed of absolute humidity and presence/absence of Houston toad MOVE activity on the previous night as predictors.
Typically, relative humidity sensors are polymeric, while those for absolute humidity consist of aluminum oxide.
Takata has provided no justification for limiting the geographic scope to the high absolute humidity region," the head of NHTSA's Office of Defects Investigation, Frank Borris, said in the letter.
Car maker Toyota said it is working with Takata to fix the issue of rupture and trying to gauge the influence of absolute humidity as a factor in causing this.
Absolute humidity is a measurement of water vapor in the air, while relative humidity measures air moisture content relative to the air temperature.
Since most high relative humidity hours occur at mild conditions--when indoor and outdoor absolute humidity levels are similar--there is very little humidity reduction benefit.
The daily average outdoor temperature and absolute humidity is represented along the horizontal and vertical axis respectively.
With a miniature space envelope of 80mm in length and 12mm diameter, this versatile probe has a range of output signal options and offers %RH, dew-point, absolute humidity or wet bulb along with temperature readings.
4, Absolute humidity is -- associated with influenza
For the summer case, a constant absolute humidity inside the zone is assumed.
Shaman used the team's research data and substituted absolute humidity for relative humidity in analysing potential correlations with flu transmission.
0] = 101234 Pa; drying air temperature and absolute humidity were set at 72[degrees]C and 0.