Question

what is vacumn ? why sound cannot travel through vacumn
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Answer 1

Answer:

A vacumn is a place where there is no air.

Sound cannot travel in vacumn because sound needs a medium to travel and a vacumn doesn't have any medium

Answer 2

Answer:

Vacuum is place which doesn't contain any type of matter(no air ,liquid or gas).(But according to quantum mechanics some tiny fluctuations are always there ,and gravitational force is always acting.) But according to your question vacuum means a place with 'no air'.

Sound can't travel through a vacuum because sound needs a medium to travel,and in vacuum no medium is there...Sound can travel well in mediums like air,liquid,and solid**