* Constantly moving in random directions (Brownian motion)

* Colliding with each other

Molecules:

- Vibrating about equilibrium positions within chemical formulas and compounds with the following types of vibrations depending on molecular structure and composition::

- Stretching vibrations

- Bending vibrations

- Torsional/rotational vibrations

These motions and collisions give rise to various physical properties of matter, such as temperature, pressure, and diffusion.