وحدة النظام الأساسية لقياس كمية المادة تسمى. نظام الوحدات الدولي

Current 1967 : The amount of substance of a system which contains as many as there are atoms in 0 Despite the prefix "kilo-", the kilogram is the base unit of mass
Online Categorised Metric Conversion Calculator• Clockwise from top: , , , , , and gives a historical background to the SI system

النظام الدولي للوحدات (SI)

Interim definitions are given only when there has been a significant difference in the definition.

نظام الوحدات الدولي
March 1976 [First published October 1963]
مفهوم المول
Current 1967 : The amount of substance of a system which contains as many as there are atoms in 0
شارح الدرس: تعريفات وحدات النظام الدولي
: National Bureau of Standards
March 1976 [First published October 1963] Frommer's Puerto Rico 8th ed
The and , once given special status, are now considered dimensionless derived units 9747 of the for 1900 January 0 at 12 hours

النظام الدولي للوحدات

Original 1946 : The value of the new candle is such that the brightness of the full radiator at the temperature of solidification of is 60 new candles per square centimetre.

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النظام الدولي للوحدات
The definitions of the other base units are more complicated
مفهوم المول
Original 1900 : The of a substance in mass grams
النظام الدولي للوحدات (SI)
United Kingdom and the former Empire Logo of the American National Metrication Council, an organization set up by to coordinate the country's transition to the metric system