If the temperature remains unchanged and the mixing ratio drops, the relative humidity will increase.

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Quizplus · Accepted Answer

Relative humidity measures the percentage of moisture in the air relative to its capacity to hold water vapor at its current temperature. If the temperature remains constant and the mixing ratio decreases (less moisture in the air), the capacity for the air to hold water vapor also decreases. This means that the actual amount of moisture in the air would be a smaller percentage of the air's capacity, resulting in a decrease in relative humidity, not an increase.

If the Temperature Remains Unchanged and the Mixing Ratio Drops