Crystal Cozart ESC1000 December 6, 2009 Ch. 19 Homework 1.) Humidity is the amount of water vapor in air. Absolute humidity is the mass of water vapor in a given volume of air. Relative humidity is the amount of water vapor in air compared to the amount the air could hold at that temperature. Because cold air holds less water vapor than warm air holds, the relative humidity increases even though the amount of water vapor remains constant. 2.) Three atmospheric processes cool air to its dew point and cause condensation: (1) Air cools when it loses hear by radiation. (2) Air cools by contact with a cool surface such as water, ice, rock, soil, or vegetation. (3) Air cools when it rises. 3.) When hot moist air is cooled, producing condensation, air reaches its dew point and water droplets or ice crystals appear. If the dew point is below freezing, frost forms. When water condenses, the condensation is called dew . An example is when plants, houses, windows, and other objects lose heat by radiation and become cool after the Sun sets. Then, during the night,
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