Equivalent temperature

The equivalent temperature is the temperature of the air that is reached when all of the water vapor it contains condenses and the thermal energy released is used to increase the air temperature.

It can be calculated over

T _eq. = T _air + L _v / c _p · x   T _air + 2.5 K · x ${\displaystyle \approx }$  

With

L _v = specific heat of vaporization of water. This value depends on the temperature and is around 2.5 · 10 ⁶ J / kg at 25 ° C

c _p = specific isobaric heat capacity of dry air, 1005 J / (kg K) ${\displaystyle \approx }$ ${\displaystyle \cdot }$

x = mixing ratio ; Mass fraction of the water in relation to the mass of the dry air (to be used here in g / kg)

T = temperature in Kelvin

Web links

• German Weather Service (equivalent temperature, pdf)