what is a dewpoint?

Question

they've been saying it on the weather alot

Answer 1

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 as the water vapor no longer creates dew but instead creates frost or hoarfrost by deposition.

Answer 2

1. The dewpoint is a measure of how moist the air mass itself is; that's why the Weather Channel's new dewpoint maps show us the movement of moist air masses across the country. Source: www.unc.edu
2. The dewpoint is this critical temperature at which condensation occurs. Source: www.unc.edu
3. The dewpoint temperature is most commonly observed in ambient air and is also called the saturation temperature of water vapor in air. Source: www.temperatures.com
4. At a dewpoint of 75 F the air is definitely unpleasant, and at a dewpoint of 80 F the humidity is hazardous: sweating no longer cools human bodies effectively and heat stroke is the price of overexertion. Source: www.unc.edu
5. Measurements of dewpoint and related humidity conditions represent a significant use of temperature sensors, usually integral to the device or instrument that reports the dewpoint temperature or humidity conditions. Source: www.temperatures.com
6. In other words, the dewpoint temperature, or dewpoint, is the temperature at which the liquid water, or dew, evaporates at the same rate at which it condenses. Source: www.temperatures.com
7. Unlike humidity, the dewpoint is not based upon the temperature or pressure of the air, but solely upon the water vapor content. Source: www.webref.org
8. The dewpoint temperature assumes there is no change in air pressure or moisture content of the air.

Answer 3

The dewpoint is a measure of atmospheric moisture. It is the temperature at which air must be cooled in order to reach saturation (assuming that air pressure and moisture content are constant). As the surface of the earth cools at night, warm moist air near the ground is chilled and water vapour in the air condenses into droplets on the grass and other objects. Dew is particularly heavy on clear nights, when the earth cools rapidly. When a blanket of cloud insulates the earth, the cooling rate is slower. The greater the difference between the temperature and the dew point, the drier the air.

Answer 4

Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening. As the exposed surface cools by radiating its heat, atmospheric moisture condenses at a rate greater than that of which it can evaporate, resulting in the formation of water droplets.

When temperatures are low enough, dew takes the form of ice; this form is called frost.

Because dew is related to the temperature of surfaces, in late summer it is formed most easily on surfaces which are not warmed by conducted heat from deep ground, such as (grass) leaves, railings, car roofs, and bridges.

Culturally dew is often associated with purity and freshness. This is evidenced by the names of certain popular beverages such as Mountain Dew and Sierra Mist.

Dew should not be confused with Guttation, which is the process by which plants release excess water from the tips of their leaves.

http://en.wikipedia.org/wiki/Dew

Answer 5

no shyt and my boyfriend keeps telling me about it like i give a jolly godddamn.