- It has weak intermolecular forces (van der Waals forces) between its molecules.

- The molecules are small and light.

- The kinetic energy of the molecules is high enough to overcome the intermolecular forces and keep the molecules moving freely.

Methanol is a liquid at room temperature and pressure because:

- It has stronger intermolecular forces (hydrogen bonding) between its molecules.

- The molecules are larger and heavier.

- The kinetic energy of the molecules is not high enough to overcome the intermolecular forces and keep the molecules moving freely.

In general, the stronger the intermolecular forces between molecules, the higher the boiling point of the substance. The larger and heavier the molecules, the higher the boiling point. And the higher the kinetic energy of the molecules, the lower the boiling point.