What happens to relative humidity when the air temperature increases without adding moisture?

When the air temperature increases without adding moisture, the relative humidity decreases. Relative humidity is a measure of the amount of water vapor present in the air compared to the maximum amount of moisture the air can hold at that temperature. As temperature rises, the capacity of the air to hold water vapor also increases. Therefore, if no additional moisture is added, the percentage of water vapor in the air relative to its increased capacity results in a lower relative humidity.

For instance, if the temperature of a given volume of air rises, the air can hold more moisture, but if the actual amount of moisture remains the same, the relative humidity will drop. This relationship illustrates how temperature and moisture content affect humidity levels in the atmosphere.