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Air molecules are connected with their neighbors with springs. If you compress one of them and let go, the tiny movement will spread out--that's a sound wave. It's similar to the wave in a stadium. Me sitting up and down urges next person to do the same and the movement continues; consequently, the cheer travels around the stadium. When a wave propogates, it is the energy or enthusiasm that travels, not the molecules or people themselves. Hearing is different from smelling because of this. You can detect the sound of a fart before the actual molecules get you. Hear the hisser? Flee the scene!