Sound travels faster through solids and liquids than it does through gases because particles are together in solids or liquids than in gases. sound also travels fastest through elastic materials.

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Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.