Unit 1 Listen and Read:
Basics and Definition of Metrology.Categories of Metrology
Metrology comes from the Greek word “metron" and “logos" which literally means the study of measurement. This study covers both the experimental and theoretical aspects of measurement and the determination of the levels of uncertainty of these aspects. The study of measurement is a basic requirement in any field of science and technology, most essential in engineering and manufacturing. The knowledge about anything is complete only when it can be expressed in numbers and something is known about it. Thus for every kind of quantity measured, there must be a unit to measure it and express it in numbers of that unit. In metrology, we have to go one step ahead and see for the correctness of measurement also. We have to see whether the result is given with the sufficient correctness and accuracy for the particular need or not. Metrology is also concerned with the methods, execution and estimation of accuracy of measurements; the measuring instruments and the inspectors.