Question

what do you mean by vacuum​

Answer 1

a space entirely devoid of matter

Answer 2

Here is short explanation of VACUUM

Vacuum is space devoid of matter. The word stems 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. ... For example, a typical vacuum cleaner produces enough suction to reduce air pressure by around 20%.

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