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What does sound really look like?

When sound waves travel through air, the air vibrates. Air is invisible, so sound is invisible.

We can "see" sound indirectly, by detecting the air vibrations with a microphone and representing them digitally.

Alternatively, we can see how the vibrations shape materials like water and sand.

Perhaps the closest we can get to "seeing" sound is this experiment where the air vibrations divert light.

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