Solid: a solid is a state of matter that is tightly packed and vibrating in place. Solids do not take the shape of their containers. Matter can only be broken from this state through heat that breaks the bonds called melting, the change from solid to a liquid, or a more advanced stage called sublimation, the change from a solid directly to a gas. A solids bonds are shaped like a box with the bonds forming rows inside.
Liquid: a liquid is a state of matter in which the molecules are loosely packed and slide past one another while vibrating. Liquids also take the shape of their containers. This form of matter can be broken by either heat, called vaporisation, or cold, called freezing.
Gas: a gas is a state of matter in which the molecules are very widely spaced (for molecules) and move past eachother at high speeds bouncing off the walls of their containers. Gas can change to a liquid through the process of condencing and going directly to a solid called deposition.
All of this is described in this video:
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