What is a liquid?

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Q1: What is different between a liquid and a solid?

[Answer]

A liquid is a material that moves freely, but stays together.

Heat a solid and it will turn into a liquid. Cool a liquid and it will turn into a solid. So if solids and liquids are the same material, why are they different?

The answer is in the way the particles are held together. In a solid the particles are locked together. In a liquid they can slide over one another.