# How does boiling point relate to molecular mass?

Of course, this assumes $\text{all things being equal}$, which they NEVER are. Boiling point interrogates intermolecular forces. In the absence of other intermolecular forces, hydrogen bonding, dipole-dipole, etc. DISPERSION or Van der Waals forces between molecules relate to the size and transient polarizability of the electron cloud. The bigger the electron cloud (and thus the higher the atomic number, and molecular mass), the higher should be the boiling point.