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Ch 13...

Humitidy The amount of water vapor in a given amount of air.
Relative Humidity The percentage of water vaper in the air compared to the maximum amount of water vapor that air can contain at a particular temperature.
Psychrometer An instrument used to measure relative humidity, consisting of a wet-bulb thermometer and a dry-bulb thermometer.
Condensation The process by which molecules of water vapor in the air become liquid water.
Dew point The temperature at which condensation begins.
Cirrus Wispy,feathery clouds made mostly of ice crystals that form at high levels.
Cumulus Fluffy, white clouds, usually with flat bottoms that look like rounded piles of cotton.
Stratus Clouds that form in flat layers and often cover much of the sky.
Air Mass A huge body of air that has similar temperature, humidity, and air pressure throught.
Tropical A warm air mass that forms in the tropics and has low air pressure.
Polar A cold air mass that forms north of 50 degrees north latitude or south of 50 degrees south latitude and has high air pressure.
Maritime A humid air mass that forms over oceans.
Continental A dry air mass that forms over land.
Front The boundary where unlike air masses meet but do not mix.
Occluded Cut off, as in a front where warm air mass is caught between two cooler air masses.
Cyclone A swirling center of low air pressure.
Anticyclone A high-pressure center of dry air.
Storm A violet disturbance in the atmosphere.
Thunderstorm A small storm often accompanied by heavy precipitation and frequent thunder and lighting.
Hurricane A tropical storm that has winds of about 119 kilomiters per hour or higher.
Storm Surge A dome of water that sweeps across the coast where a hurricane lands.
Meteorologist A scientist who studies the causes of weather and tries to predict it.
Isobar A line on a weather map that joins places that have the same air pressure.
Isotherm A line on a weather map that joins places that have the same temperature.
Created by: 080252
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