# the trick how to guess SI system and CGS system

Dear student,

Just remember the basic units of the SI system, that is Kg, m, s and for CGS units g, cm, s.
The other units are devired from mostly these units.
But, some quantity has units with special denotions, such as, Joule as SI unit for energy and erge as CGS unit of energy.
Even though you can derive these units from the basic units, you need to remember these special units.

Regards

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u have to learn it
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