why is sound wave called machine wave
Answers
Sound waves are mechanical waves because they need a material medium for propagation, like air or liquids like water, or metals like silver. That is the defining criterion for a mechanical wave, and the answer to your question.
The other type of waves, called electromagnetic waves (like light) do not need a material medium to travel, and can even go through vacuum.
When traveling through air, sound waves propagate in the form of pressure variations wherein high-pressure regions called compressions alternate with low pressure regions called rarefactions.
Mechanical waves are the waves which require matter (medium) for their propagation and transfer energy through the medium. Light is a kind of electro-magnetic wave(which do not require any material medim for propagation), where as ,sound requires a medium ,thus, is a mechanical wave.
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