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why would a sound wave travel faster through a solid than a gas? Why can they not travel in outer space (which is a vacuum) at all? explain

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Answer:

They travel fastest when the particles are able to collide more. Because there is no medium in a vacuum, it will travel the fastest. ... Solids, because of how close the particles are.

Explanation:

They travel fastest when the particles are able to collide more. Because there is no medium in a vacuum, it will travel the fastest. ... Solids, because of how close the particles are.