Distinguish between gases, liquids, and solids in terms of the particle theory of matter in terms of mass, volume and density.

The particle theory states that matter is made up of small
indivisible particles that are in constant motion, the degree of freedom of which varies
for the different states of matter.

In the case of solids,
the particles are very close to each other and fixed in position. They can only vibrate
in the structures they are a part of. Solids have the highest mass per unit volume or
density.

In liquids, the particles can move relative to
each other but their proximity makes the volume almost constant. Liquids have a mass per
unit volume or density lying between that of solids and
liquids.

In the case of gases, the particles are
sufficiently away from each other to allow them to move freely and independent of each
other. The volume of gases can change depending on the pressure applied. They have the
lowest mass per unit volume or density.