A standard is a measuring instrument designed to define or represent, preserve or reproduce a unit of measurement of a quantity (or a multiple or submultiple of such a unit).
Various type of standard are produced, depending on how they are used. In the case of a given quantity, the primary standard is the highest quality in terms of measurement; it is never used directly for measurement except for comparison with secondary standards. Working standards used to check measuring instruments are produced from a secondary standard.
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Why is temperature not a physical quantity like other measurement units?
Temperature is not a quantity in the strict sense of the term as the majority of other measurement units are. A quantity is something which can be increased or decreased, for example length, area, power output, etc. Measuring a quantity…