Equivalent Temperature

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Equivalent Temperature

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1. Isobaric equivalent temperature; the temperature that an air parcel would have if all water vapor were condensed out at constant pressure, the latent heat released being used to heat the air,

T_{i, e} = T [1 + (Lw / c_p T)]where T_{i, e} is the isobaric equivalent

temperature; T is the temperature; w is the mixing ratio; L is the latent heat; and c_p is the specific heat of air at constant pressure. </dd>
2. Adiabatic equivalent temperature; The temperature that an air parcel would have after undergoing the following (physically unrealizable) process: dry-adiabatic expansion until saturated; pseudoadiabatic expansion until all moisture is precipitated out; dry-adiabatic compression to the initial pressure. This is the equivalent temperature as read from a thermodynamic chart and is always greater than the isobaric equivalent temperature:

T_{a, e} = T exp (Lw / c_p T)where T_{a, e} is the adiabatic equivalent

temperature. Also called pseudoequivalent temperature. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use