What are the Particles of Matter ?
Which particles of matter have space between them?
Matter simply speaking is made up of molecules/atoms. The amount of space between the particles(molecules or atoms) depends upon the state of matter.
In solids, the spaces between the particles is less.
In liquids, the spaces between the particles is quite more than solids.
In gases, the spaces between the particles is huge and they are even free to move around easily.