The characteristics of an ascending heated plume in a compressible, viscous and heat-conducting gas are studied by numerical simulation. It is known that at the subcritical height of the region, the isobaric convection regime is realized, and at the supercritical one, adiabatic and superadiabatic. It is shown that adiabatic processes play a decisive role at the supercritical height of the region, and diffusion processes at the subcritical height.
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