A scale of measurement where the position is marked using the logarithm of a value instead of the actual value.

It is useful because any equal multiplication has the same distance.

See below that the distance from 1 to 2 is the same as the distance from 2 to 4, or from 4 to 8

Other Example:

• the distance from 1 to 3 is the same as 3 to 9

• the distance from 1 to 10 is the same as 10 to 100, or 100 to 1000 etc.

See: Linear Scale