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Weather Part II (2)

Weather Part Two
STUDY
PLAY
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.