Psychrometrics Psychrometrics Dew is the term for small droplets of water that appear on thin objects in the morning or evening. This is a form of condensation. Dew results from atmospheric moisture that condenses after a warm day and appears during the night on cooled surfaces as small drops. The cool surfaces cool the nearby air, decreasing the amount of humidity (dissolved moisture) the local air can hold. The extra vapor condenses (precipitates out of solution in the air). When temperatures are low enough, dew will take the form of ice; this form is called frost. ...more on Wikipedia about "Dew"
The dew point or dewpoint of a given parcel of air is the temperature to which the parcel must be cooled, at constant barometric pressure, for the water vapor component to condense into water, called dew. When the dew point temperature falls below freezing it is called the frost point, instead creating frost or hoarfrost by deposition. ...more on Wikipedia about "Dew point"
Diamond dust is the name commonly used to refer to a ground-level cloud composed of tiny ice crystals. This meteorological phenomenon is also referred to simply as ice crystals and is reported in the METAR code as IC. Diamond dust generally forms under otherwise clear or nearly clear skies, so people sometimes also refer to it as clear-sky precipitation. It is most commonly observed in Antarctica and the Arctic, but it can occur anywhere with a temperature well below freezing. In Polar regions diamond dust may continue for several days without interruption. ...more on Wikipedia about "Diamond dust"
Fog is a cloud in contact with the ground. It occurs when moisture from the surface of the Earth evaporates; as this evaporated moisture moves upward, it cools and condenses into the familiar phenomenon of fog. Fog differs from cloud only in that fog touches the surface of the Earth, while clouds do not. It can form in a number of ways, depending on how the cooling that caused the condensation occurred: ...more on Wikipedia about "Fog"
Frost, like snow, is the result of deposition of water vapor in saturated air. If solid surfaces in contact with the air are chilled below the deposition point (see frost point), then spicules of ice grow out from the solid surface. The size of the crystals depends on time and the amount of water vapor available. ...more on Wikipedia about "Frost"
Humidity is the concentration of water vapor in the air. The concentration can be expressed as absolute humidity, specific humidity, or relative humidity. A device used to measure humidity is called a hygrometer. A humidistat is used to regulate the humidity of a building with a de-humidifier. These can be analogous to a thermometer and thermostat for climate control. Due to the changing partial pressure of water vapor in air as temperature changes, the water content of air at sea level can get as high as 3% at 30 °C (86 °F), and no more than about 0.5% at 0 °C (32 °F). ...more on Wikipedia about "Humidity"
A humidor is any kind of box or room with constant humidity (and often, temperature as well), used to store cigars. For private use, small wooden or acrylic glass humidor boxes for a few dozen cigars are appropriate, while cigar shops often have walk-in humidors, sometimes covering a whole floor. Humidors of all sizes use hygrometers to keep track of the humidity levels. ...more on Wikipedia about "Humidor" shortopedia Is Good For You.
Hygrometers are instruments used for measuring humidity. The simplest form of a hygrometer consists of two thermometers, one of which has its bulb constantly kept wet. Evaporation from the bulb lowers the temperature so that this thermometer usually shows a lower temperature. However, when the air temperature is below freezing, it is possible for the "wet bulb" (actually a thin coating of ice) to be warmer than the dry bulb. Relative Humidity is computed from the ambient temperature as shown by the "dry bulb thermometer" and the difference in temperature shown by the "wet bulb" and dry bulb thermometers. One device that uses the wet/dry bulb method is the sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes. ...more on Wikipedia about "Hygrometer"
Mist is a phenomenon of a liquid in small droplets floating through air. It can occur naturally as part of natural weather or volcanic activity, and is common in cold air above hot water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters. ...more on Wikipedia about "Mist"
Psychrometrics is the measurement of the heat and water vapor properties of air. ...more on Wikipedia about "Psychrometrics"
Relative humidity is the ratio of the current vapor pressure of water in any gas (especially air) to the equilibrium vapor pressure, at which the gas is called saturated at the current temperature, expressed as a percentage. Equivalently, it is the ratio of the current mass of water per volume of gas and the mass per volume of a saturated gas. ...more on Wikipedia about "Relative humidity"
Swamp coolers (also called " evaporative coolers" or "Air coolers") are air conditioners used to cool buildings in dry climates. The technique they use is evaporative cooling, of which two types exist: direct evaporative cooling and indirect evaporative cooling. ...more on Wikipedia about "Swamp cooler"
Water vapor or water vapour, also aqueous vapour, is the gas phase of water. On the Earth, water vapor is one state of the water cycle within the hydrosphere. Water vapor can be produced from the evaporation of liquid water or from the sublimation of ice. Under normal atmospheric conditions, water vapor is continuously evaporating and condensing. Normally, water vapor is invisible to the naked eye. ...more on Wikipedia about "Water vapor"
This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia . Direct links to the original articles are in the text.
If you use exact copy or modified of this article you should preserve above paragraph and put also : It uses material from
the Shortopedia article about "Psychrometrics".
| MAIN PAGE | MAIN INDEX | CONTACT US |