Concept explainers
Interpretation:
The reason due to which a measurement must include both the number and a unit needs to be explained.
Concept introduction:
Measurement is defined as an action of measuring something. The unit of any measurement is magnitude of the quantity which is taken by convention. It is used for the measurement of same kind of a quantity. For example, length is a physical quantity and measured in meter (as its unit).

Explanation of Solution
Measurement is an action of measuring something. The unit of any measurement is a definite magnitude of the quantity. The number and unit both must be included in the measurements because the quantitative data gives support to the problem that needs to be solved i.e. the unit describes the accurate measurements.
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