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A vacuum is a place where there is no matter, not even air. Sound cannot move in a vacuum. No place has a perfect vacuum, because a small number of particles remain, even in outer space.

A space where only some of the air is removed is also called a vacuum. The space then has lower pressure, even though most of the air remains.

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Demonstrating How Sound Can't Travel Through a Vacuum - Christmas Lectures with Charles Taylor

Demonstrating How Sound Can't Travel Through a Vacuum - Christmas Lectures with Charles Taylor
Spinning Euler's Disk in a Vacuum ChamberWill it Spin Forever

Spinning Euler's Disk in a Vacuum ChamberWill it Spin Forever
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Vacuum Rage
Vacuum Rage
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