Quantities with units that differ only by a dimensionless conversion factor are said to have the same dimensions. [M1.2, P1.1]
are: basic measurable quantities such as mass (M), length (L) and time (T). [M1.2]
can be used: singly or in appropriate combinations to characterize physical quantities. Speed, for example, can be measured in the same units as the ratio of a length to a time and is therefore said to have the same dimensions as length/time, a relationship shown by writing [speed] = [length/time] = Quantities with units that differ only by a dimensionless conversion factor are said to have the same dimensions. [M1.2, P1.1]
Copyright 1997, The Open University