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The same process is used to lift a hot air balloon off the ground. Everything on the earth is under atmospheric pressure. Think of that as the weight of everything above you weighing down. Even air has some weight. When air (a gas) gets warmer, such as in the fireplace or in the burner of the balloon, then the molecules are excited and they move farther apart from each other. This causes the air to weigh less (become less dense). When the air weighs less, then it rises. The chimney is built right next to the fire to give a place for the air to rise. The smoke particles are carried away and up the chimney along with the rising air.

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