Question

put articles as needed._unit means a measurement.​

Answer 1

The “u” in “unit” makes the “Y” sound—a consonant sound—therefore you use “a” as article.

A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement. For example, a length is a physical quantity.

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