In solids, particles are closely packed and have low energy, causing them to vibrate in fixed positions with minimal movement. In liquids, the energy increases, allowing particles to move more freely and slide past each other, resulting in greater speed. In gases, particles have the highest energy, moving rapidly and independently, which leads to even higher speeds and greater distances between them. Thus, as the energy level increases from solid to liquid to gas, the speed of the particles also increases.
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