Liquid state oxygen [closed]

In liquid state oxygen molecules are held together by what? Van der Waals forces or covalent bonding?

This should be by 'Van der Waals' forces and no different to other liquids formed by molecules without a dipole. As the molecules have no dipole the interaction should be due to the induced-dipole induced-dipole energy (or dispersion energy) between two similar molecules and which is proportional to $\alpha^2I/r^6$, where $\alpha$ is the polarisability, I the first ionisation potential and r the separation.