Relative Humidity (RH) is expressed as which of the following?

Relative Humidity (RH) is expressed as a percentage because it represents the ratio of the current amount of moisture in the air to the maximum amount of moisture the air can hold at a specific temperature. This measure allows for an understanding of how close the air is to being saturated with water vapor. For example, when the relative humidity is at 50%, it indicates that the air is holding half of the moisture it can hold at that temperature. This percentage format is essential for applications in meteorology, HVAC systems, and comfort evaluation in living spaces. Understanding relative humidity in terms of percentage is crucial for assessing moisture levels, predicting weather conditions, and managing indoor environments effectively.