Weather and Atmosphere Terms

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air mass

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A body of air that has the same temperature and/or humidity throughout.

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air pressure

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The weight of air pressing against a given area.

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condensation

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The changing of gas back to a liquid.

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high pressure

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A high pressure system is a whirling mass of cool, dry air that generally brings fair weather and light winds.

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humidity

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A measure of the amount of water vapor in the air.

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Prevailing Winds

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The global winds that blow constantly from the same direction.

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Troposphere

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Lower layer of atmosphere. All weather occurs in the troposphere.

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Water Vapor

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When liquid water turns into a gas form due to heat.

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Weather

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The state of the atmosphere at a given time and place with respect to wind, temperature, cloudiness, moisture, pressure, and other factors.

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cloud

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A visible collection of water droplets or at colder temperatures ice crystals.