Definition:Vacuum
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Definition
A vacuum is the physical state of being completely empty of matter.
It is a physical ideal, and has never been (and probably can never be) fully realised.
Also known as
In certain contexts in physics, the term free space is used for a volume of space in which there is a vacuum.
Linguistic Note
The word vacuum is a Latin word meaning empty.
Sources
- 1966: Isaac Asimov: Understanding Physics ... (previous) ... (next): $\text {I}$: Motion, Sound and Heat: Chapter $1$: The Search for Knowledge: The Greek View of Motion