Answer
This is a unit for length.
Work Step by Step
One nano-meter, given by the unit nm, is one billionth of a meter. Meters are a unit for length, so nano-meters are also a unit for length.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.