We looked today at how atoms are always moving. When you heat them they shake more. Because they shake more they need more space to move so they spread out. As they spread out they can no longer remain as a solid so they turn to a liquid. If you keep heating them they spread out more and the liquid becomes a gas. If you keep heating them then you will get plasma.
When you boil water the bubbles that rise are actually the H20 turning into a gas as it is heated. They start at the botto of the jug because that is closest to the heat.
We also looked at how condensation is the opposite action of a gas turning to a liquid as it is cooled down.
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