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Particles Are in constant motion, in a solid they vibrate in place. The only reason the solid and liquid states exist are because of intermolecular forces. These forces are what keep particles together without chemical bonds. When a solid is heated, the particles will vibrate more violently and eventually break apart and become liquid or gas once a high enough temperature is reached. This is because the IM forces are not enough to keep the molecules or atoms together once a certain temperature is reached. The atoms move too fast to stay together once the melting point is reached, causing them to flow, but once the boiling point is reached, atoms move so fast that they break away completely and diffuse freely. So yes the particles will move once a certain temperature is reached, but the particles were already moving in thee first place. Only at absolute zero temperature will the particles be still..at this point scientists have not been able to bring anything to absolute zero, probably because to observe something, you must blast energy, or light, at it. They can get extremely close, within a few or fractions of degrees, but never absolute zero.

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