Sounds as vibrations can travel through many different materials.
Sound can travel through solids, like metal, stone and wood.
Sound can travel through liquids, like water.
Sound can travel through gases, like air.
Sound vibrations travel better through some materials than others. For example, sound vibrations travel very well along metal pipes.
Sound cannot travel through a completely empty space (a vacuum), which has nothing, not even air, in it. If there is a vacuum between a sound-making object and our ears, we won't be able to hear the sound.
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