SI Units
This page is about SI Units. This page is in progress by Jinyoung Lee.
The Main Idea
SI unit stands for the 'International System of Units'. It is the modern form of the metric system, and is the most widely used system of measurement. It is made up of 7 standard units. It justify twenty-two named units, and includes many more unnamed coherent derived units. The system also establishes a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units.
A Mathematical Model
There are some mathematical operation required to translate a non-SI unit to SI unit. For example [math]\displaystyle{ {\frac{lb}{2.2}} = kg }[/math] Since 1 kg(SI unit) is equal to 2.2 lb, to change lb to SI unit, lb has to be divided by 2.2.
Another example can be length. [math]\displaystyle{ {\frac{inch}{0.394}} = cm }[/math] Same method used to change lb to kg. Since 1cm is equal to 0.394inch, inch has to be divided by 0.394 to become SI unit, cm.
Base SI units
Prefix
Connectedness
This topic can be applied to every aspect of science. When solving the problem, or even when doing a research, every equations and theories are based on SI units. It is a promises between scientists to use the certain unit to reduce the errors or misunderstanding. Therefore, it is very important to know the concept of SI units. This topic is connected to not only physics but also every other scientific subjects. In addition, it might not be familiar in United States, but in the most of the countries they use SI units in ordinary life.
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See also
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