Journal of Physical Studies 21(1/2), Article 1001 [10 pages] (2017) DOI: https://doi.org/10.30970/jps.21.1001 THERMODYNAMIC QUANTITIES OF THE LOW-DENSITY GAS IN THE WEAKLY NONEQUILIBRIUM HEAT-CONDUCTION STEADY STATE IN THE LINEAR TEMPERATURE PROFILE APPROXIMATION Y. A. Humenyuk Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., Lviv 79011, Ukraine, e-mail: josyp@icmp.lviv.ua

The weakly nonequilibrium low-density gas with a steady heat flow is considered within the approximation of a linear temperature profile. Simple analytical estimates for pressure, internal energy, and entropy are obtained. Compressibilities and heat capacities are analyzed. The result for the entropy is shown to be compatible with the second law of thermodynamics. The approximation of the displaced linear temperature profile is introduced, which is aimed to take into account the higher temperature gradients.

PACS number(s): 05.70.Ln, 51.30.+i, 44.10.+i

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