Question

How can not sound travel through vacuum? Why?

Answer 1

Explanation:

because sound is a mechanical wave which requires a material medium to travel and in vacuum there is no material medium so the sound cannot travel there.

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Answer 2

here is your answer mate:-

But it seems that in some circumstances, sound can jump between objects in a vacuum after all. Sound waves are travelling vibrations of particles in media such as air, water or metal. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate

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