<P> In trade, weights and measures is often a subject of governmental regulation, to ensure fairness and transparency . The International Bureau of Weights and Measures (BIPM) is tasked with ensuring worldwide uniformity of measurements and their traceability to the International System of Units (SI). </P> <P> Metrology is the science of developing nationally and internationally accepted units of measurement . </P> <P> In physics and metrology, units are standards for measurement of physical quantities that need clear definitions to be useful . Reproducibility of experimental results is central to the scientific method . A standard system of units facilitates this . Scientific systems of units are a refinement of the concept of weights and measures historically developed for commercial purposes . </P> <P> Science, medicine, and engineering often use larger and smaller units of measurement than those used in everyday life . The judicious selection of the units of measurement can aid researchers in problem solving (see, for example, dimensional analysis). </P>

What is a standard unit of measurement necessary in science and industry