出典:Wikipedia
出典:『Wikipedia』 (2010/07/31 11:12 UTC 版)
The potential density of a fluid parcel at pressure P is the density that the parcel would acquire if adiabatically brought to a reference pressure P0, often 1 bar (100 kPa). Whereas density changes with changing pressure, potential density of a fluid parcel is conserved as the pressure experienced by the parcel changes (provided no mixing with other parcels or net heat flux occurs). The concept is used in oceanography[1] and (to a lesser extent) atmospheric science.