Editing Relative permittivity (section)

=== Terminology ===
The historical term for the relative permittivity is ''dielectric constant''. It is still commonly used, but has been deprecated by standards organizations,<ref name=IEEE1997>{{cite journal |author=[[IEEE]] Standards Board|url=https://ieeexplore.ieee.org/document/8638365|title=IEEE Standard Definitions of Terms for Radio Wave Propagation | journal=IEEE STD 211-1997 |year=1997 |page=6}}</ref><ref name="IUPAC">{{cite journal |last=Braslavsky |first=S.E.|url=http://iupac.org/publications/pac/2007/pdf/7903x0293.pdf |title=Glossary of terms used in photochemistry (IUPAC recommendations 2006)|journal=Pure and Applied Chemistry|volume=79 |issue=3 |year=2007 |pages=293–465|doi=10.1351/pac200779030293|s2cid=96601716}}</ref> because of its ambiguity, as some older reports used it for the absolute permittivity ''ε''.<ref name=IEEE1997/><ref>{{cite book
|last = King
|first = Ronold W. P.
|author-link = Ronold W. P. King
|title = Fundamental Electromagnetic Theory
|publisher = Dover
|year = 1963
|location = New York
|page = 139}}</ref><ref name=Jackson/> The permittivity may be quoted either as a static property or as a frequency-dependent variant, in which case it is also known as the ''dielectric function''. It has also been used to refer to only the real component ''ε''′<sub>r</sub> of the complex-valued relative permittivity.{{citation needed|date=September 2013}}