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Molecules in the gas state move much faster than their liquid or solid states.

Depending on the temperature and pressure, molecules can exist in three states: gas, liquid, or solid. At high temperatures and low pressures, the gas state is favored. When the molecule is in the gas state, it actually hits other molecules and bounces in random directions. A molecule moving as a gas is like a weightless Baseball hit inside a big empty room in outer space. The baseball bounces everywhere, and it moves very fast. In a gas, every time the molecule hits another molecule, it also bounces like the baseball.

In comparison, molecules in their liquid state can move, but they move much slower, because but they do not separate from each other. The movement of a liquid molecule is like you moving in a room packed with people. You can move, but you are always in contact with someone.

Even slower are molecules in their solid state. In fact, they do not move much at all. This time imagine that you are in a packed room, but now you are all sitting in connected chairs. You can wiggle your head, arms and legs, but you cannot leave the chair. Since you cannot leave the chair, and because the chairs are stuck together, you can not move your entire body to another place in the room. Using this analogy, molecules in the solid state are the slowest.

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12y ago

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