The SI has 7 base units. These units can be combined in an almost unlimited way to form other (derived) units. The Wikipedia article on "SI derived units" lists some examples.
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What should you do to change a value in SI units to a value in U.S. customary units?
SI means "International System [of Units]" (from the French abbreviation).
they are units for scientist
http://physics.nist.gov/cuu/Units/units.html
The SI unit for velocity is m/s. Therefore the SI units for velocity squared would be m2/s2.
In SI units, that would be the Newton.In SI units, that would be the Newton.In SI units, that would be the Newton.In SI units, that would be the Newton.
or Kg equivalent.
Derived SI units.
SI and metric are the same units.
International System of Units (SI)
Search the Wikipedia for "SI"; there you'll find many of the international units.
Base units
The SI has 7 base units: http://en.wikipedia.org/wiki/SI_base_unit Also, the SI has tens of derived units - perhaps hundreds of them, since you can combine the base units in many ways. Those units are ultimately derived from the 7 base units. For example, units for area, volume, speed, force, energy, pressure, electric charge, voltage, and many more, are derived from some of the base units. http://en.wikipedia.org/wiki/SI_derived_unit
most of the world does SI so more people can understand with it in SI units
most of the world does SI so more people can understand with it in SI units
SI units are more accurate than English system units
Si and metric are the same thing. SI was a redefinition of metric in 1960.