Question

what is the need of SI units​

Answer 1

The internationally accepted standard units are the SI units. The International System of Units, universally known as the SI (from the French Systeme International d’Unites) is necessary because lack of standard unit of measurement would cause confusion and a waste of time in converting from one unit to another all the time. So, the SI system is adopted all over the world as the standard measurement unit system.

Answer 2

Standard unit of measurement provides a reference point by which objects of weight, length or capacity can be described. Standard units are the units used all over the world for measuring a particular quantity. The need of a standard unit arises when we deal with people when from other places.