* Gravitational force is extremely weak at the scale of atoms and molecules. The force of attraction between two molecules due to gravity is insignificant compared to the forces that actually hold them together.

* Electromagnetic forces dominate: Molecules are held together by electromagnetic forces, specifically chemical bonds. These bonds arise from the interaction of electrons between atoms.

* Covalent bonds: Atoms share electrons to achieve a stable electron configuration.

* Ionic bonds: Atoms transfer electrons, resulting in positively and negatively charged ions that attract each other.

* Hydrogen bonds: A special type of dipole-dipole interaction involving hydrogen.

In summary: While gravity is a fundamental force, its effects on molecules are negligible compared to the much stronger electromagnetic forces responsible for chemical bonding.