Water Cycle and Related Concepts

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Water Cycle

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The movement of water through Earth’s systems, powered by the sun’s energy.

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Evaporation

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The process by which liquid water escapes into the air after becoming water vapor (gas).

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Condensation

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The process by which water vapor (gas) becomes liquid water.

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Humidity

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The amount of water vapor in a given volume of air.

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Relative Humidity

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The percentage of water vapor in the air compared to the maximum amount of water vapor that air can hold at a given temperature.

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Psychrometer

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An instrument used to measure relative humidity.