Work is devoted to comparative research of flat and spatial models of expansion pair. In frameworks quasistationarity symmetric approximation the private analytical decision of system gazedynamic the equations for a case of expansion sated pair is received. It is shown, that by the example of such decision it is possible to carry out the correct qualitative analysis of a problem generally. Numerical estimations of parameters of expansion are carried out by the example of carbon pair.

Keywords: saturated, expansion, condensation, gazedynamic, nanoparticles, carbon.