Equivalent potential temperature

Equivalent potential temperature (often denoted as \( \theta_e \)) is a concept used in meteorology to describe the temperature that an air parcel would have if it were brought adiabatically (without heat exchange) down to a standard reference pressure, typically 1000 hPa (hectopascals), and if all of its water vapor were condensed into liquid water. It serves as a useful measure for understanding the thermodynamic stability and energy content of an air parcel.