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Sound relies on particles of matter to transfer its energy. For instance, when you speak, that sound wave travels through the air particles, pushing each one towards the next with the message of sound to the ear of another person for example. Even in water, sound does travel, but it's harder to hear because water is so dense.

In a vacuum, there is no air, so no air particles to carry the sound, and thus, no sound can be heard.

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14y ago

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