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Potential temperature: Standards, Comments & Derivation
The potential temperature of a parcel of fluid at pressure P {\displaystyle P} is the temperature that the parcel would attain if adiabatically brought to a standard reference pressure P 0 {\displaystyle P_{0}} , usually 1,000 hPa (1,000 mb). The potential temperature is denoted θ {\displaystyle \theta } and, for a gas well-approximated as ideal, is given by
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