Matter is anything that occupies space and has mass. Thus,
there are fundamentally three types of matter which is solid liquid and gas.
But why do gases and liquids diffuse and not solids? It is because of the
molecular structure of these components of matter. If we examine the molecular structure
of gas the molecules are highly scattered and liquid has also almost the same structure
as mediocrely scattered that these particles can easily slip through other
substances unlike solid which is entirely intact.
