Solid: fixed, regular arrangement, particles can only vibrate, forces between particles the strongest, Liquid: close irregular arrangement, particles can flow past each other but remain close, Gas: spread out, move in all directions, irregular arrangement, forces between particles the weakest, Melting: particles gaining (potential) energy so they can slide past each other, does not get hotter until all of the material is liquid, Boiling: particles break free of attraction, particles gain (potential) energy and spread out, also called evaporating, Condensing: Particles lose (potential) energy and move together, but they can still flow, also called liquifying, Freezing: particles lose (potential) and energy move a regular arrangement, also called solidifying,

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