Measuring a quantity means comparing it to a quantity of the same type taken as a reference. This latter quantity constitutes a unit of measurement; the set of legal units of measurement constitute a system known as the Système International (SI).
In metrology, the science of measurement, the term measure or measurement has a number of meanings which it is worth noting here; it may refer to:
- a value: the measurement of a distance is 100 metres
- a result: measurement to within 1%
- an action: making a measurement of electric power
- an instrument: a capacity measure
To avoid ambiguity, it is preferable to refer to the value of a quantity, the result of a measurement, measuring and measuring equipment. However, where there is no possibility of confusion, a measurement refers to the result of measuring.
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