How does sound propagate in a medium?

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Solution

Sound is produced by vibrating objects. Sound is a mechanical wave and needs a material medium like air, water, steel etc. for its propagation. A vibrating object moves back and forth rapidly, a series of compressions and rarefactions is created in the air. These make the sound wave to propagate through the medium.

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Why does sound require a medium to propagate why can't it propagate in vacuum?

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