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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.
03-10-2013 05:06:04
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details