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In a solid, molecules barely move and are tightly squeezed together, keeping the same shape. When a solid is melted down to a liquid, the molecules move more frequently and shape to the container they are held in.
When you heat a solid, it becomes a liquid. For example, if you heat ice up on the stove, it will eventually melt down to water, a liquid.
SOLID (compressed and non-moving)
As a liquid turns to a gas, the molecules begin to increase their movement and spread out more. Both liquids and gases move to the shape of the container/space they are in.
LIQUID (shaped to container; more movement)
When you heat a liquid, it evaporates and turns to a gas. For example, when you heat water on the stove, it turns to water vapor, a gas.
The molecules in gas are constantly moving, expanding or shrinking to fit the space they are in. Depending on how tight of a space they're in, the molecules are closer or farther apart.
For example, the air all around us is a gas, moving and changing every time we move.
GAS (expands to space; wide range of movement)
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