Vacuum has been a frequent topic of philosophical debate since ancient Greek times, but was not studied empirically until the 17th century. Evangelista Torricelli produced the first laboratory vacuum in 1643, and other experimental techniques were developed as a result of his theories of atmospheric pressure. A Torricellian vacuum is created by filling a tall glass container closed at one end with mercury, and then inverting it in a bowl to contain the mercury (see below).[6]
A vacuum is a space devoid of matter. The word is derived from the Latin adjective vacuus for "vacant" or "void". An APPROXIMATION to such vacuum is a region with a gaseous pressure much less than atmospheric pressure.[1]
https://en.wikipedia.org/wiki/Vacuum
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