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 fundamental dimensions are:

  • Mass, denoted $M$ or $\mathbf M$
  • Length, denoted $L$ or $\mathbf L$
  • Time, denoted $T$ or $\mathbf T$

It is convenient at elementary levels of physics to add:

However, it is possible to define these in terms of mass, length and time, so strictly speaking they are not fundamental, as such.


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.