When particles in a solid or liquid move faster they move slightly further
apart and is referred to as Elastic collision
Liquids and gases possess more kinetic energy than solids which is why
there is movement of its atoms in a system. Gas have the highest kinetic
energy and solids have the lowest. When the atoms move ,they collide with
one another which pushes the particles further apart.
The atoms in liquid and gas exhibit vibrational(rotational) motion which brings about movement and collision of the particles.
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