Transformations of Matter-Radiation Gas Mixtures

Details Transformations of Matter-Radiation Gas Mixtures Transformations of Matter-Radiation Gas Mixtures

Mar 1940

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1940phrv...57..516w&link_type=abstract

Physical Review, vol. 57, Issue 6, pp. 516-521

Astronomy and Astrophysics

Astrophysics

Scientific paper

Emden found that for a perfect material gas, the transformations along the isochor, the adiabat, the isotherm and the isobar are all forms of the general polytropic transformation λ=dQdT=const. An alternative definition of a polytrope is Γ=-(dpp)(dvv)=const. When radiation energy density and pressure are considered, it is found that λ is a constant only on the adiabat, and Γ only on the isobar. A discussion follows concerning the relation of these results to certain polytropic distributions of interest in astrophysics.

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