Why does warm air contain more water vapor than cold air?
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A oft-repeated water vapor myth is that warm air can “hold” more water vapor than cool air because as the air warms its molecules move farther apart, making room for more molecules. ... But, saying cold air can't hold as much water vapor as warmer air is at best a metaphor for what happens.
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At a given amount of water vapor in the air, the vapor is will condense and fall as rain at a lower temperature than at a higher one. The temperature at which the given amount of water will condense is called the Dew Point.
At a given temperature, more saturated air will fall as rain than drier air.
So it’s a balance. Dry air has a very low Dew Point. Moist air has a high Dew Point.
Case in point: Where I live, it was raining at 8 AM, but as daytime temperatures rose, the rain stopped even though the clouds persist overhead. Rain is predicted to resume some time between 8 and 10 PM, when the temperature will be 53 degrees (11 C), so that likely is the Dew Point.
At a given amount of water vapor in the air, the vapor is will condense and fall as rain at a lower temperature than at a higher one. The temperature at which the given amount of water will condense is called the Dew Point.
At a given temperature, more saturated air will fall as rain than drier air.
So it’s a balance. Dry air has a very low Dew Point. Moist air has a high Dew Point.
Case in point: Where I live, it was raining at 8 AM, but as daytime temperatures rose, the rain stopped even though the clouds persist overhead. Rain is predicted to resume some time between 8 and 10 PM, when the temperature will be 53 degrees (11 C), so that likely is the Dew Point.
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