Apparent temperature is the temperature perceived by humans. Relative humidity is a commonly used metric in weather reports and forecasts and is a good indicator of precipitation, dew, frost, fog, and apparent temperature. Given the same amount of water vapor, there will be a higher relative humidity in cool air than there is in warmer air. It is affected by both temperature and pressure.

The higher the percentage, the higher the humidity. Relative humidity compares the current ratio of absolute humidity to the maximum humidity for a given temperature and expresses this value as a percentage. If the volume is not fixed, as in the atmosphere, absolute humidity changes in response to the volume changes caused by the temperature and pressure variation. Given the same amount of water vapor in the air, the absolute humidity does not change with the temperature at a fixed volume. It is calculated by dividing the total mass of water vapor by the volume of the air. The value for absolute humidity is returned as part of the results of the calculation, but it is relative humidity that is widely used in everyday life and is used as part of the calculation of dew point temperature.Ībsolute humidity is the measurement of the water content in the air, typically in units of grams per cubic meter. Humidity is often discussed in terms of absolute humidity and relative humidity, as it is on this calculator. The maximum water vapor can hold by air is affected by temperature the higher the temperature, the greater the amount of water vapor it can hold before reach saturation. It is an indicator of the presence of dew, frost, fog, and precipitation. Humidity is defined as the amount of water vapor (gaseous phase of water) in the air.

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