Question

is this possible to speak on vaccum​

Answer 1

Answer:

Sound needs a medium to travel. In your case, while speaking, the vocal chords vibrate which in turn vibrates the air by way of contraction and expansion, kind of like a wave. ... You can still hear your own voice by the way of bone conduction

Explanation:

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Answer 2

Answer:

sound needs particles to propagates. And as space vaccum between to two astronaut have very few ( if any ) of them , this isn't possible to happen but the sound can be converted into electromagnetic waves, those being able to travel with no problems through vaccum.

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