Why are sound waves called mechanical waves?

Answer 

Those waves which require a medium to propagate are called Mechanical Waves.

Sound Waves can only travel through a medium like solid, liquid or gas.

It cannot travel through a vacuum.

Thus, sound waves are mechanical waves

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo