Warm air is able to hold much more water vapor than cold air before it becomes saturated (100% relative humidity). How would you expect the relative humidity of air to change as air warms up in the morning? How would you expect it to change as air cools in the evening?​

The warmer the air, the greater its capacity for water vapor. Thus, the relative humidity increases as the temperature falls toward the dew point and decreases as it rises. The relative humidity is usually highest around sunrise when the overnight low temperature is frequently close to the dew point.

At night, the temperature of the air cools down and often reaches its dew point temperature, so the water vapor in the air changes to a visible liquid (dew) or solid (frost). During this change in state, from vapor to a liquid or to frost, a large amount of heat is released.

Explanation:

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