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| The Clausius-Clapeyron relationship leads us |
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| to the concept of relative humidity. Relative |
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| humidity
is defined as the ratio of the amount |
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| of water vapor in the air to the amount of |
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| water vapor that air would hold if it were |
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| saturated. So completely
saturated air has a |
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| relative humidity of 100%.
If the air has half |
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| as much water vapor as it can hold, the |
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| relative
humidity is 50%. |
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