|Definition by words||
Quantity for which all the exponents of the factors corresponding to the base quantities in its quantity dimension are zero
The measurement units and values of quantities of dimension one are numbers, but such quantities convey more information than a number.
Some quantities of dimension one are defined as kind-of-quantity divided by the same kind-of-quantity
The mathematical equation is:
Other kinds-of-quantity of dimension one that may not be defined as above is Numbers of entities.