Weather Part II (2)

22 terms by Bobothedolphin 

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Weather Part Two

Precipitation

The falling to earth of any form of water (rain or snow or hail or sleet or mist.)

Latent Heat

Heat absorbed or radiated during a change of phase at a constant temperature and pressure.

Evaporation

The process by which water changes from liquid form to an atmospheric gas.

Condensation

The process of changing from a gaseous to a liquid or solid state.

Deposition

The change of state from a gas directly to a solid.

Humidity

The amount of water vapor in the air.

Saturated

Being the most concentrated solution possible at a given temperature.

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.

Dew Point

The temperature at which the water vapor in the air becomes saturated and condensation begins.

Psychrometer

Instrument used to measure relative humidity.

Dry Adiabatic Rate

The rate of adiabatic cooling or warming in unsaturated air; the rate of temperature change is 1°C per 100 meters.

Wet Adiabatic Rate

The rate of adiabatic temperature change in saturated air; the rate of temperature change is variable, but it is always less than the dry adiabatic rate.

Orographic Lifting

Cloud formation that occurs when warm moist air is forced to rise up the side of a mountain.

Frontal Wedging

Lifting of air resulting when cool air acts as a barrier over which warmer, lighter air will rise.

Convergence

The occurrence of two or more things coming together.

Convective Lifting

Weather process where the sun heats the land surface, which heats the adjacent air, and then the heated air rises.

Front

The atmospheric phenomenon created at the boundary between two different air masses.

Thermals

Column of air rising in lower altitudes of Earth's atmosphere.

Stable Air

Air that resists vertical displacement; if it is lifted, adiabatic cooling will cause its temperature to be lower than the surrounding environment; if it is allowed, it will sink to its original position.

Unstable Air

Air that does not resist verticle displacement; if it is lifted, its temperature will not cool as rapidly as the surrounding environment, and so it will continue to rise on its own.

Temperature Inversion

Atmospheric condition in which warm air traps cooler air near the earth's surface.

Condensation Nuclei

Microscopic particles on which water vapor condenses to form cloud droplets.

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