Definition:Dimension (Measurement)

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Definition

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:

$\mathsf M$: mass
$\mathsf L$: length
$\mathsf T$: time
$\Theta$: temperature
$\mathsf I$: electric current
$\mathsf N$: amount of substance
$\mathsf J$: luminous intensity


Units

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.


Examples


Sources