gas: A substance that can only be contained if it is fully surrounded by a container (or held together by gravitational pull) a substance whose molecules have negligible intermolecular interactions and can move freely.It takes the shape of its container but maintains constant volume.
liquid: A substance that flows and keeps no definite shape because its molecules are loosely packed and constantly moving.Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.Particles can move about within a liquid, but they are packed densely enough that volume is maintained. Liquid matter is made of more loosely packed particles.A solid will retain its shape the particles are not free to move around.
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