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Every physical quantity has a dimension associated with it.
No attempt is made here to provide an abstract definition of this term. Instead, it will be defined by example.
The SI-recommended fundamental dimensions are:
|\(\ds \mathsf M:\)||mass|
|\(\ds \mathsf L:\)||length|
|\(\ds \mathsf T:\)||time|
|\(\ds \mathsf I:\)||electric current|
|\(\ds \mathsf N:\)||amount of substance|
|\(\ds \mathsf J:\)||luminous intensity|
Compare with units of measurement.
This concept of dimension is more abstract than that of units, which are standard quantities of the particular dimension in question.
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): dimensions