a previous paper  we already showed the strict connection existing
between certain macroscopic physical properties of a given compound
(like the speed of sound and Young's modulus of elasticity) and some
atomic features like the electron charge, the atomic mass, and the
intermolecular distance. Here those relations are generalized and
similar connections are found for the thermal expansion coefficients
and the surface tension of liquids with the same atomic properties.
This seems to imply that the various phases of matter are essentially
due to ionic forces that appear even outside the bodies and are in
agreement with a well-known experience by Ettore Majorana.