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A "vacuum" is a state of emptiness or a void (Latin vacuus, from vacare, to empty).

Classically, it is used to denote a space absent of matter, or of air, as in outer space.

A "pure vacuum" (or complete vacuum) is a state of containing absolutely no matter, which only theoretically exists.

A vacuum cleaner is a cleaner that uses electricity. Vacuums suck up dust from the floor and they put it in a bag where it keeps all of the dust.

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6y ago
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10y ago

An absence of matter.

A space empty of matter.

A space relatively empty of matter.

A space in which the pressure is significantly lower than atmospheric pressure.

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Q: What is a vacuum?
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