The width of a person’s thumb.

The distance from a man’s elbow to the tip of his middle finger

Used for a more convenient and accurate standard of measurement

Derived from based quantities

defined as "Comparison of an unknown quantity with some known quantity of the same kind".

In early times, measurement used the following as basis of measurement, except;

The distance from the tip of a person’s nose to the tip of his middle finger

Appointed the committee that created METRIC SYSTEM.

physical quantities, where no quantity in the subset can be expressed in terms of the others.