Question

A dimensionless quantity
1 point
never has & unit
O always have a unit
may have a unit
does not exist​

Answer 1

Answer:

Characteristic numbers are dimensionless numbers used in fluid dynamics to describe a character of the flow. To compare a real situation with a small-scale model it is necessary to keep the important characteristic numbers the same. Names of these numbers were standardized in ISO 31, part 12.

Answer 2

Explanation:

iSo part 31 is the example