Why Does Sound Not Travel in a Vacuum?

Answer

Sound does not travel in vacuum. This is because In empty space, there is no air, and what we call sound is actually vibrations in the air. Light is able to travel through space and a vacuum because it travels in form of light waves which do not require air.
Q&A Related to "Why Does Sound Not Travel in a Vacuum"
Sound waves don't just travel the slowest in a vacuum, they don't travel at all. The reason is that sound waves, like all mechanical waves, need a medium to travel through.
http://wiki.answers.com/Q/Why_does_a_sound_wave_tr...
Spoken sound waves use air to travel along. As a vacuum does not contain any
http://www.chacha.com/question/why-will-sound-not-...
A clogged or dirty separator may be the culprit behind the loud sound. Rainbow vacuums utilize a basin equipped with water to rid households of dirt, and the separator sits on top
http://www.ehow.com/info_8301191_rainbow-sound-lik...
the others are correct but to re-word it "sound requires something to vibrate off of and vacuum has nothing"
http://answers.yahoo.com/question/index?qid=200801...
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