Question

Why si unit is called coherent system

Answer 1

It meas that all SI units are derived from finite basic units with no other factor than one (1).

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Answer 2

It meas that all SI units are derived from finite basic units with no other factor than one (1).

For example,

F=ma⇒1N=1kg×m/s2

W=Fs⇒1J=1N×m

However, in other systems, this is not true.

For instance, in metric engineering units, the force is measured by kilogram-force (kgf). A factor of 1kgf9.80kg×m/s2 must be used.

Well known coherent systems are SI, CGS and MKS (a subset of SI now). all metric units.