The problem of molecular thermal (P-q) polarization estimation in the
substances with different forms of aggregation and using different exp
erimental techniques is discussed. It is shown on the base of numerous
experimental data analysis that P-q includes both rotational (P-rot)
and orientational (P-or) components, which may be commensurable in mag
nitude in gases and gasiform condensed media. The principle of equal d
istribution of molecules' thermal polarization over their kinetic degr
ees of freedom is being satisfied, so P-rot term should not be neglect
ed. The neglect of this fact on estimation of the molecular dipole mom
ents using the first method of Debye results in root(5/3) or root(4/3)
times overestimated dipole moment values.