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School vacuum pump for demonstrational purposes
Author: Hannes Grobe (talk) – own work, Schulhistorische Sammlung Bremerhaven, CC BY 3.0,
The snippet comes from Wikipedia: https://cs.wikipedia.org/wiki/Vakuum
A vacuum (from the Latin vacuus, empty) is a space in which the gas pressure is significantly lower than in a space with atmospheric pressure. Thus, it is an environment with a very low particle density and theoretically in an ideal vacuum without their presence.

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