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A region of completely empty matter, discovered by Evangelista Torricelli in 1643. He was treated very badly by the Roman Catholic Church at the time, who declared a vacuum was impossible, as God was omnipresent. He was buried in an unmarked grave for his pains (although a lunar crater has been named after him.
In physics, a vacuum is any enclosure in which gas pressure is considerably less than atmospheric pressure (101,325 pascals).
Preserving food in a vacuum is a very form of preservation.