Eq. 5 works well in calculating gas solubility and specific heat capacity . Readers may ask why the molecular interaction is not reflected in the equation of state. As mentioned above, the interaction energy in liquid transforms into the bond energy stored in gas. Since gas has a similar VG at an equal temperature, an intense interaction gives a small VL, thus requiring much system work for evaporation. For example, water exhibits a high boiling point and a large latent heat of evaporation.