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This is due to particle movements. There are three states of matter; Solid, Liquid and gas. The papticles in these states have different amounts of energy.

Solid particles have the least energy and therefore the particle move very little. This means they are held together in a tight structure and have a fixed shape.

Liquid particles have more energy (thats why we heat solids into liquids, melting) These particles in a liquid are able to move and therefore are able to move the shape of the container. Gravity pulls everything to the lowest possible position, therefore liquids always have a horizontal surface.

Gases have the most energy, these are completely free from each other and are able to move throughout the atmosphere, so will fill up the shape of any space, diffusion of smells shows this.

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14y ago

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