A formula is derived for the dependence of the thermal radiation energy of a gas molecule on its kinetic energy. From this formula it follows that the radiation energy of a molecule is not equal to its kinetic energy. Since the mean free path of molecules is larger in more rarefied gases, the energy of thermal radiation in such gases is, accordingly, greater. For the same reason, the smaller the size of the gas molecules, the volume of empty space in such a gas will be greater, and, consequently, the gas will be more discharged, so that the energy of emission of gas molecules in comparison with the kinetic energy of the molecule will be even greater.
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