System of Quantities and Units

Abstract

There are a large number of quantities like length, volume, acceleration, force, momentum, electric charge, current, potential, inductance, etc., which require measurement. It must be clear from the very beginning that there is no fundamental difference in the basic principles of measurement,whether they are made in physics, chemistry, laboratory medicine, biology, or engineering. An attempt, therefore, has been made to meet conceptual needs ofmeasurements in fields such as biochemistry, food science, forensic science, and molecular biology.

However, most of the quantities are either connected with each other by definition or through a physical phenomenon. A system of quantities, therefore, is a set of quantities together with a set of non-contradictory equations relating to those quantities.