Assuming no additional water vapor is added to the air, increasing the air's temperature will increase the relative humidity.

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Quizplus · Accepted Answer

Increasing the air's temperature without adding more water vapor will actually decrease the relative humidity. This is because as the air gets warmer, it can hold more water vapor without reaching maximum capacity. Therefore, the same amount of water vapor in the air will make up a smaller percentage of the air's total capacity, resulting in a lower relative humidity.

Assuming No Additional Water Vapor Is Added to the Air