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what is the velocity of sound in vaccum
Sound is a mechanical wave, so it can't travel in vacuum. Sound speed will be higher
when the molecules of the material it is traveling are closer to each other, this means
that it travels the fastest in solids, medium speed in liquids and slower in gases.

In vacuum, the speed of sound is zero. Sound doesn't propagate through vacuum.
Shout as loud as you want to, and the sound goes nowhere if there's no medium to
carry it.


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