humidity


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Related to humidity: relative humidity, Humidity Control

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.

hu·mid·i·ty

(hyū-mid'i-tē),
Moisture or dampness, as of the air.
[L. humiditas, dampness]

hu·mid·i·ty

(hyū-mid'i-tē)
Moisture or dampness, as of the air.
[L. humiditas, dampness]

hu·mid·i·ty

(hyū-mid'i-tē)
Moisture or dampness, as of the air.
[L. humiditas, dampness]
References in periodicals archive ?
Sunny intervals and a gentle breeze, 19 degrees but feels like 20 degrees with good visibility, a 13% chance of rain and and 61% humidity
The Met office said humidity was recorded at 30pc with north-easterly wind direction.
Air intake humidity affects engine efficiency in terms of max cylinder pressure, torque, and pollutant emissions.
The researchers found that low humidity hindered the immune response of the animals in three ways.
Production area Temperature Weighing, Mixing 68 to 72[degrees]F (20 to 22[degrees]C) Compression 68[degrees]F (20[degrees]C) Pan coating 53 to 203[degrees]F (12 to 95[degrees]C) Filling and Packing 68[degrees]F (20[degrees]C) Storage 68 to 77[degrees]F (20 to 25[degrees]C) Production area Humidity Weighing, Mixing 35 to 40% RH Compression 25 to 35% RH Pan coating 10 to 70% RH Filling and Packing 10 to 35% RH Storage 45% RH Figure 2: Typical conditions in solid dosage production.
In this article, a methylcellulose coated humidity sensor based on MZI with waist enlarged structure is demonstrated.
In the present work, the effects of relative humidity on the zero signal of a torque transducer and a DMP40 measuring amplifier were studied under increasing RH conditions at four different constant temperatures.
According to today's weather bulletin, humidity is expected to peak at 90 per cent in the UAE's coastal areas.Temperature is also taking a dip with a forecast low from 23-28 degrees in the coastal areas and highs up from 34-38C.
The continuing evolution of building design, construction, and materials--especially windows--have resulted in some significant changes in the ability of buildings to withstand higher relative humidity levels, without condensation in the building envelope during the winter season.
Gases were assessed using a clinical, main-stream capacitive thermohygrometer (Moiscope, Siynet, Tokyo, Japan; response time, 3 s within the range of 40 to 100%; accuracy, [+ or -]0.5[degrees]C for temperature and [+ or -]3.5% for relative humidity) [12,13] placed between the distal end of the inspiratory circuit and the Y-piece ("Y-piece" temperature and humidity) (Figure 1).
occidentalis to conditions of high humidity, which may partially account for the distribution and abundance of these species in Florida (Chellemi et al.