Understanding the science behind humidity calculations
Absolute humidity is the mass of water vapor present in a unit volume of air, typically expressed in grams per cubic meter (g/m³). Unlike relative humidity, which changes with temperature, absolute humidity provides a direct measure of the actual water content in the air.
This measurement is crucial for various applications including:
Our calculator uses the scientifically accepted Magnus formula combined with the ideal gas law to provide accurate absolute humidity calculations.
Using the Magnus formula to determine the maximum water vapor pressure at the given temperature.
Multiply saturation vapor pressure by relative humidity percentage.
Convert vapor pressure to absolute humidity using molecular weight and gas constants.
Where T is temperature in Celsius, es is saturation vapor pressure in hPa
Where RH is relative humidity percentage, e is actual vapor pressure in hPa
Where AH is absolute humidity in g/m³, T is temperature in Kelvin
The following scientifically established constants are used in our calculations:
18.016 g/mol
8314.5 J/(kmol·K)
17.67
243.5 °C
6.112 hPa
To ensure accurate calculations, the following limits are enforced:
| Parameter | Minimum | Maximum | Unit |
|---|---|---|---|
| Temperature | -273.15 | 1000 | °C |
| Relative Humidity | 0 | 100 | % |
Our calculator provides results with high accuracy suitable for most practical applications:
This application is built using modern web technologies: