SI is based on 'centimetre-gram-second'
Base units
Seven metric base units make up the foundation of SI. And Specific combinations of SI base units yield derived units. That's why the differ.
There are 7 base SI units and all other are defined using these 7 base units. See the related question below:[http://wiki.answers.com/Q/What_are_all_the_SI_unitsWhat are all SI units?]
The SI base unit for temperature is the kelvin.
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
There are 7 base SI units and all other are defined using these 7 base units. See the related question below:[http://wiki.answers.com/Q/What_are_all_the_SI_unitsWhat are all SI units?]
Base units
In a system of units such as the SI, BASE UNITS are defined; other units are derived from those.For example, in the SI, the meter, the kilogram, and the second are base units; the units for area (meters squared), for speed and velocity (meters/second), etc. are derived from the base units. Which units are base units, and which units are derived units, really depends on how the unit is defined. For example, in the SI, pressure is a derived unit; but you can just as well invent a system in which pressure is a base unit, and some other units, that are base units in the SI, are derived in this new system.
Seven metric base units make up the foundation of SI. And Specific combinations of SI base units yield derived units. That's why the differ.
There are seven SI base units. Refer to the related link below for a table of the seven SI base units.
There are 7 base SI units and all other are defined using these 7 base units. See the related question below:[http://wiki.answers.com/Q/What_are_all_the_SI_unitsWhat are all SI units?]
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A Joule in SI base units is: 1 kg · m2/s2
SI is a base 10 standardized system
A Joule in SI base units is: 1 kg · m2/s2
Kelvin The SI base unit of temperature is the kelvin.
The SI base unit for temperature is the kelvin.