Physics

Mixing Ratio of Air Calculator

Find the water vapor mixing ratio of air.

Calculated Output

Mixing ratio (g/kg) 11.892

Formula: w = 0.622·e ÷ (P − e)

Step-by-Step Breakdown

1. Values used:

2. Temperature = 25 °C

3. Relative humidity = 60 %

4. Air pressure = 1,013 hPa

6. Mixing ratio = 11.892g/kg

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The math behind it

w = 0.622·e ÷ (P − e), where e is the actual vapor pressure (from RH and the Magnus formula).

25 °C, 60% RH, 1013 hPa → about 11.9 g/kg.

Mixing ratio vs specific humidity?

Mixing ratio uses dry-air mass; specific humidity uses total moist-air mass.