Question

why sound cant travel in vaccum

Answer 1

@yogandhar Sound needs particles to travel through unlike light which does not need particles. IN vacuum there aren't any particles present so sound cannot travel through vacuum.

Answer 2

Watch the movie 'Gravity', although usually movies butcher the science of life in space, I think it does a good job at merging fact and cinematography! Gripping and informative :)

Answer 3

Sound is the vibration of molecules, and since there is absolutely nothing in a vacuum, there are no molecules to vibrate. or
Sound is made up of waves .
Sound needs a medium to travel in.
A vacuum is void of matter,
thus no medium to transmit the wave.