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Meanings of si system in English
Portuguese
sistema internacional de unidades 
A complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)
See moreUsage of si system in English
1
This new standard is the definition of the kilogram, the unit of mass in the SI system-theInternational System of Units).