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Water in the Air

Water in the Air. The Water Cycle. Water in liquid, solid, and gaseous states is constantly being recycled though the water cycle. Humidity. As water evaporates from lakes, oceans, and plants, it becomes water vapor, or moister in the air. Water vapor is invisible

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Water in the Air

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  1. Water in the Air

  2. The Water Cycle • Water in liquid, solid, and gaseous states is constantly being recycled though the water cycle.

  3. Humidity • As water evaporates from lakes, oceans, and plants, it becomes water vapor, or moister in the air. • Water vapor is invisible • The amount of water vapor in the air is called humidity.

  4. Humidity • The air’s ability to hold water vapor changes as the temperature of the air changes. • As temperature of the air increases, the air’s ability to hold water vapor also increases.

  5. Relative Humidity • Relative humidity is the amount of water vapor in the air compared with the maximum amount of water vapor that the air can hold at a certain temperature. • Relative humidity is given in percents. • When air holds all of the water that it can hold at a given temperature, it is said to be saturated. • Saturated air has a relative humidity of 100%.

  6. Relative Humidity • Water vapor and temperature affect relative humidity. • The more water vapor in the air, the higher the relative humidity. • Relative humidity decreases as the temperature rises and increases as temperature drops. • A psychrometer is an instrument that is used to measure relative humidity.

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