Question

what is a system of units

Answer 1

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurementbuilt on seven base units (ampere, kelvin, second, metre, kilogram, candela, mole) and a set of twenty decimal prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units. The system also specifies names for 22 derived units for other common physical quantities like lumen, watt, etc.

Answer 2

hello friend...!!!

⇒ the fundamental units of length, mass , time together form system of units.

A) C.G.S system : 
⇒ where for length C denotes centimeter and for mass G denotes gram and for time S denotes seconds.

B) M.K.S system :
⇒ for length M denotes meter , for mass K denotes kilogram , for time S denotes seconds .

C) S. I system :
⇒ it is the standard international system , its unit for mass,time,and length are same as that of M.K.S system .this S I system also includes the fundamental units . that is 1) length ( meter ) . 2) mass ( kilogram ) . 3) time ( second) . 4) temperature ( kelvin ) . 5) current ( ampere ) 6) luminous intensity ( candela ) . 7) amount of substance ( mole) .

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hope it is useful..!!