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When you heat a solid, the molecules vibrate a little bit, which causes them to take up space and spread out more. If it heats up more it will begin to melt, which is called melting point. Solids are in a tight, regular pattern, and they don't move around much.
When you heat a liquid, the molecules start to vibrate a little bit faster, which causes them to take up space and spread out way more. Liquids are close together but aren't in a nice and neat line and are able to go at a medium speed past each other very easily.
When you heat a gas, the molecules vibrate super fast, which causes to separate from eachother. The particles of a gas move really fast and have a large amount of spaces between each other so they can move faster than a solid or liquid can.
They move side to side and up and down very slowly.
They move past eachother at a medium speed.
They move all around and have a very large amount of space to roam.
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