7.0 Dimensions

  Unit and Dimensions

Dimensions of a physical quantity are the powers to which the fundamental quantities must be raised to represent the given physical quantity.

Note:

• Dimensions are denoted with square brackets $[\ ]$.
• Length has the dimension $[L]$, mass $[M]$, time $[T]$, electric current $[A]$, thermodynamic temperature $[K]$, luminous intensity $[cd]$ and amount of substance $[mol]$.
• Using the square brackets $[\ ]$ around a quantity means that we are dealing with the dimensions of the quantity.