النظام الدولي للوحدات. النظام الدولي للوحدات si

Being one thousandth of a cubic metre, the litre is not a coherent unit of measure with respect to SI Clockwise from top: , , , , , and
The kilogram, not the gram, is used in the definitions of derived units Current 1967 : The duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two levels of the of the 133 atom

سوابق النظام الدولي للوحدات

Original 1881 : A tenth of the electromagnetic CGS unit of current.

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النظام الدولي للوحدات (SI)
Prefixes The litre is classed as a non-SI unit accepted for use with the SI
إعادة تعريف الوحدات الأساسية في النظام الدولي للوحدات
It was renamed the " kelvin" symbol "K"; "kelvin" spelt with a lower case "k" in 1967
سوابق النظام الدولي للوحدات
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
The seven and the interdependency of their definitions At the close of the 19th century three different systems of units of measure existed for electrical measurements: a also known as the Gaussian or ESU system , a SI base units :23 Unit name Unit symbol Definition Incomplete m• Interim 1954 : The 0
Since there is no prototype marked 8, this prototype is referred to as 8 41 When the mole is used, the elementary entities must be specified and may be , , , , other particles, or specified groups of such particles

اوسع انظمة الوحدات انتشارا في جميع انحاء العالم النظام

Unit names as adjectives In English, a space is recommended between the number and the unit symbol when used as an adjective, e.

النظام الدولي للوحدات si
9747 of the for 1900 January 0 at 12 hours
سوابق النظام الدولي للوحدات
Porter, Darwin; Prince, Danforth 2006
ما النظام الدولي للوحدات
25th Meeting of the Consultative Committee for Thermometry