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As discussed in the Know the Law section, sound waves travel through a medium by means of particle-to-particle interaction. The source sets surrounding particles vibrating about their fixed position. By means of particle-to-particle interaction, all particles within the medium are soon vibrating about their fixed position. Sound waves can travel through any medium in this fashion by means of particle-to-particle interaction. But don't be fooled! Sound waves cannot travel through no medium. That is, sound waves cannot travel through a region of space void of matter - a vacuum. In the absence of particles, sound waves no longer exist.
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