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 why do sound needs a medium to travel?

Sound propagates when an objects vibrates which produces disturbance in the medium. These disturbances travel through the medium as sound waves in the form of alternating compressions and rarefactions. Therefore sound needs a medium for propagation. 

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Sound is basically a form of kinetic energy--energy of motion. It is transmitted when a particle in a medium gets a bit of energy, by being bumped by a neighboring particle maybe, and passes some or all of this energy along by bumping another particle.If there's no medium, then there are no particles to bump or be bumped. So...no medium=no bumping=no sound.The sound you hear is the result of this bumping finally reaching tiny hairs deep in your ear.
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