Editing Philosophy of physics (section)

===Space===
{{Main|Space}}

Space is one of the few fundamental quantities in physics, meaning that it cannot be defined via other quantities because there is nothing more fundamental known at present. Thus, similar to the definition of other fundamental quantities (like [[time]] and [[mass]]), space is defined via measurement. Currently, the standard space interval, called a standard metre or simply metre, is defined as the [[speed of light|distance traveled by light in a vacuum]] during a time interval of 1/299792458 of a second (exact).

In [[classical physics]], space is a three-dimensional [[Euclidean space]] where any position can be described using three [[coordinate system|coordinate]]s and parameterised by time.  Special and general relativity use four-dimensional [[spacetime]] rather than three-dimensional space; and currently there are many speculative theories which use more than three spatial dimensions.