Editing Theoretical definition (section)

===In natural science===
The definitions of substances as various configurations of atoms are theoretical definitions, as are definitions of [[color]]s as specific [[wavelength]]s of reflected light.

====Physics====

The first [[postulate]] of [[special relativity]] theory that the [[speed of light]] in vacuum is the same to all inertial observers (i.e. it is a constant, and therefore a good measure of length). Of interest, this theoretical concept is the basis of an [[operational definition]] for the length of a [[metre]] is ''"the distance traveled by [[light]] in a [[vacuum]] during a time interval of 1/299,792,458 of a [[second]]"''.  Thus we have defined 'metre' according to other ideas contained in modern scientific theory. Rejection of the theory underlying a theoretical definition leaves the definition invalid for use in argument with those who reject it — neither side will advance its position by using terms the others do not accept {{citation needed|date=March 2015}}.

[[Heat]] explains a collection of various laws of nature and that predict certain results.<ref name=ConciseIntro>''A Concise Introduction to Logic'' by Patrick J. Hurley. 2007. Cengage learning. Entry on "Theoretical Definitions" may even be available through google books{{full citation needed|date=August 2014}}</ref>