What is Relative Humidity?

What is Relative Humidity?

Relative humidity is the amount of water vapor (vapor pressure) that is in the air. It is a percentage of how much moisture the air could possibly hold. Relative humidity is a combination function of the actual moisture content of the air, the temperature, and the barometric pressure. The amount of vapor that can be contained in the air increases with temperature. The higher the percentage of relative humidity, the more humid (moist) the air feels, while a lower percentage usually feels drier. Saturation occurs when air is holding the maximum amount of water vapor possible at the existing pressure and temperature. Saturation is equal to 100% relative humidity, resulting in precipitation.