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  1. In solids, molecules are fixed in their positions but they possess energy that allows them to vibrate at their positions.

  2. In liquids and gases, the molecules are further apart and in constant motion.

  3. The motion of the molecules is in a random zig-zag manner.

  4. This is brought about by the bombardment between the molecules and is termed brownian motion.

  5. The speed of the molecules is dependent on

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the mass of the molecule and

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the surrounding temperature.

  1. The lighter the molecule the faster it can move.

  2. The higher the surrounding temperature, the more energy the molecule possesses, the faster it can move.