Metrology is the science of measurement derived from the Greek word metro-logy, which includes all aspects of both theoretical and practical reference to measurements, their uncertainty and in whatever fields of science or technology they occur. One of the most illustrious scientists of the 19th century, Lord Kelvin, once remarked in a lecture "Knowledge about anything is complete only when it can be measured and expressed in numbers. When you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind". Broadly speaking, Metrology is mainly concern with: 1) Establishing the units of measurements, reproducing these units in the form of -standards, and ensuring the uniformity of measurements 2) Developing methods of measurements 3) Analyzing the accuracy of methods of measurements, establishing uncertainty of measurements, researching into the causes of measuring errors and finally eliminating those.
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