free space

In physics, free space is a concept of electromagnetic theory, corresponding roughly to the vacuum, the baseline state of the electromagnetic field, or the replacement for the electromagnetic aether. It occurs in the expressions permittivity of free space and permeability of free space; one defines the permittivity or permeability of a given material. In this setting it simply means no material present, and so corresponds to a theoretical idea of measurement carried out on a perfect vacuum.

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