In other words, it is a flow in which isobaric surfaces are isopycnic surfaces and vice versa.
2.
In general isopycnic surfaces will occur in fluids in hydrostatic equilibrium coinciding with equipotential surfaces formed by gravity.
3.
Isopycnic surfaces contrast with isobaric or isothermal surfaces, which describe surfaces of constant pressure and constant temperature respectively.
4.
It is common in conversational use to hear isopycnic surfaces referred to simply as " iso-density " surfaces, which while strictly incorrect, is nonetheless abundantly more clear.
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