The unit of measurement for humidity in RMKS is expressed as what?

Humidity is a measurement of the amount of water vapor present in the air relative to the amount that air can hold at a given temperature. This measurement is typically expressed as a percentage because it represents a ratio of the current moisture in the air to the maximum moisture the air can hold at that temperature. When humidity is indicated in percentage terms, it provides a clear and easily understandable representation for meteorological analysis and communication.

The percentage format allows for straightforward comparisons and insights into weather conditions. For instance, a relative humidity of 50% means the air currently holds half of the maximum possible moisture at that temperature. This is crucial for various applications, including weather forecasting and understanding comfort levels.

While other units like Pascals, milibars, or degrees Celsius are important in other meteorological contexts—such as pressure measurements or temperature—they do not directly communicate the moisture content of the air in the way percentage does, making percentage the standard unit for expressing humidity.