.1Units and Dimensions
The most two commonly used systems of units:
•SI, System International units.
•AE, American Engineering system units.
Dimensions and units are classified to:
•Fundamental (basic) dimensions/units: It can be measured independently and are sufficient to describe essential physical quantities (meter, kilogram, second, Kelvin, mole, .. etc).
•Derived dimensions/units: It can be developed in terms of the fundamental dimensions/units (joule, Newton, watt, .. etc).
Example 1.4:
A semiconductor is ZnS with a particle diameter of 1.8 nm, convert this value to (a) dm (decimeters), (b) in (inches).
•Fundamental (basic) dimensions/units: It can be measured independently and are sufficient to describe essential physical quantities (meter, kilogram, second, Kelvin, mole, .. etc).
•Derived dimensions/units: It can be developed in terms of the fundamental dimensions/units (joule, Newton, watt, .. etc).
Example 1.4:
A semiconductor is ZnS with a particle diameter of 1.8 nm, convert this value to (a) dm (decimeters), (b) in (inches).
•Fundamental (basic) dimensions/units: It can be measured independently and are sufficient to describe essential physical quantities (meter, kilogram, second, Kelvin, mole, .. etc).
•Derived dimensions/units: It can be developed in terms of the fundamental dimensions/units (joule, Newton, watt, .. etc).
Example 1.4:
A semiconductor is ZnS with a particle diameter of 1.8 nm, convert this value to (a) dm (decimeters), (b) in (inches).
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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