Give a physical quantity which has no units ?

1 Answer
Mark C.
Sep 9, 2017

Lots of things can potentially have no units, it often means the quantity is a ratio.

Explanation:

Strain is a good example, because it is the ratio of original length to extended length, the units cancel and it is dimensionless. This is the correct term for 'having no units'.

Coefficients of friction also fall into this category.

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