Formula
The formula for is the following:
Where:
- = equivalent temperature
- = Temperature of air at pressure
- = pressure at the point (in same units as )
- = standard reference pressure (1000 mbar or 100 kPa)
- = specific gas constant for air (287 J/(kg·K))
- = specific heat of dry air at constant pressure (1004 J/(kg·K))
- = latent heat of evaporation (2400 kJ/kg {at 25 °C} to 2600 kJ/kg {at −40 °C})
- = mixing ratio of water vapor mass per mass of dry air (g/Kg or in Kg/Kg.)
Read more about this topic: Equivalent Potential Temperature
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