Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. ... Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.\
if they are more stable and more still they are solid if they are slitly agitated and move around more then it's a liquid but if they are completely moving fast without any hesitation then it's a gas.
