In Eq. 30, the SI unit of L is m, and the mass of electrons (me) is 9.11×10 -31 kg. However, the α value for electrons is unknown. Provided that two electrons are separated with 10 -10 m, i.e., 1.0 Å, the repulsive force calculated with Coulomb's law is 2.30×10 -8 N. However, Yu and Polycarpou issued the force difference of molecular interaction, ~10 -5 N in 1.0~5.0 Å . It is much bigger than the coulomb's force (10 -8 N/1.0 Å) of two electrons. Hence, their model was not appropriate. In contrast, the calculated repulsive molecular interaction at the equilibrium distance by Eq. 19 is about ~10 -11 N/1.0 Å. Of course, the attractive molecular interaction is also in the same order, depending on temperature. It indicates that Eq. 19 is applausive in the microscopic world.