In the above discussion, helium is not mentioned because its behavior is weird. It should be noted that the data on helium-4 in the technical note has been adopted. By comparison with the data in the NIST Chemistry WebBook, it is found that WebBook digested the technical note data from 2.18 to 5.20 K. As shown in Fig. , at first, it is disturbing in mathematics that the Y•T~T curve is not a straight line, in contrast to so-far concerned other gases, in which both Y~1/T and Y•T~T curves are straight lines, and also the linear regressions give similar results. Moreover, A is negative. For example, 4.22-5.20 K, A=0.3009; 3.2-4.22 K, A=0.0152; 2.05-3.2 K, A=-0.4843; 1.05-2.05 K, A=-0.8058; 0.8-1.05 K, A=-1.3004. It means that the entropy of a liquid or solid is more significant than that of a gas at the same temperature.