It is therefore used in dimensionless numbers which compare the ratio of the diffusivities.

As defined here, the intrinsic viscosity is a dimensionless number.

They are often called dimensionless numbers as well.

Generally, energy conversion efficiency is a dimensionless number between 0 and 1.0, or 0 to 100%.

These dimensionless numbers account for all the variables listed above except F, which will be the test measurement.

It is also the age of the universe expressed as a dimensionless number.

C is the drag coefficient - a dimensionless number.

His basic approach was to combine several fundamental constants in order to produce a dimensionless number.

If energy output and input are expressed in the same units, efficiency is a dimensionless number.

Since the units are consistent, the power factor is by definition a dimensionless number between -1 and 1.