Definition:Dimension (Measurement)

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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.

Fundamental Dimensions

The SI-recommended fundamental dimensions are:

  \(\ds \mathsf M:\) mass      
  \(\ds \mathsf L:\) length      
  \(\ds \mathsf T:\) time      
  \(\ds \Theta:\) temperature      
  \(\ds \mathsf I:\) 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.