Measurement unit, unit of measurement, unit
It is a scalar quantity, defined and adopted by convention, with which any
other quantity of the same kind can be compared to express the ratio of the
two quantities as a number.
For example, length is a physical quantity. The metre is a unit of length that represents a definite predetermined length. When we say 10 metres (or 10 m), we actually mean 10 times the definite predetermined length called "metre".
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