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Using the three-component spectral model describing the FIRAS averagecontinuum spectra, the analytical expressions for the temperature dependence ofthe thermodynamic and radiative functions of the galactic far-infraredradiation are obtained. The COBE FIRAS instrument data in the 0.15 - 2.88 THzfrequency interval at the mean temperatures T = 17.72 K, T = 14 K, and T =6.73K are used for calculating the radiative and thermodynamic functions, such asthe total radiation power per unit area, total energy density, totalemissivity, number density of photons, Helmholtz free energy density, entropydensity, heat capacity at constant volume and pressure for the warm,intermediate-temperature and very cold components of the Galactic continuumspectra. The generalized Stefan-Boltzmann laws for the warm,intermediate-temperature and very cold components are constructed. This resultis important when we construct the cosmological models of radiative transfer inthe inner Galaxy. Within the framework of the three- component spectral model,the total number of photons in our Galaxy and the total radiation power (totalluminosity) emitted from the surface of the Galaxy are calculated. Otherradiative and thermodynamic properties of the galactic far-infrared radiation(photon gas) for the Galaxy are presented. The expressions for astrophysicalparameters, such as the entropy density/Boltzmann constant, and number densityof the galactic far-infrared photons are obtained. We assume that the obtainedanalytical expressions for thermodynamic and radiative functions may be usefulfor describing the continuum spectra of the far-infrared radiation for outergalaxies.

On the radiative and thermodynamic properties of the cosmic radiations using COBE FIRAS instrument data: III. Galactic far-infrared radiation