Definition:Dimension (Measurement)

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.