Question

what are the si units
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Answer 1

Explanation:

These are units when a county or certain Nation performs an international experiment they have to measure it in S.I unit

Need of S.I unit=>

There are many country who use

CGS many MKS and many FPS

so there were difficultly in exchange of info so S.I unit

(international unit )

Answer 2

Answer:

The International System of Units (abbreviated SI from systeme internationale , the French version of the name) is a scientific method of expressing the magnitudes or quantities of important natural phenomena. There are seven base units in the system, from which other units are derived.