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Equivalent potential temperature, commonly referred to as theta-e {\displaystyle \left} , is a quantity that is conserved during changes to an air parcel's pressure , even if water vapor condenses during that pressure change. It is therefore more conserved than the ordinary potential temperature, which remains constant only for unsaturated vertical motions.
θ e {\displaystyle \theta _{e}} is the temperature a parcel of air would reach if all the water vapor in the parcel were to condense, releasing its latent heat, and the parcel was brought adiabatically to a standard reference pressure, usually 1000 hPa which is roughly equal to atmospheric pressure at sea level.
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