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
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No, not all metric units are part of the International System of Units (SI). The SI is a coherent system of units derived from the metric system, but it is more specific and defined, and not all metric units are included in the SI.
The abbreviation for the International System of Units is SI.
The International System of Units (SI) is also known as the metric system.
There are many systems. A system is a collection of units which are used together. The two commonest are the SI units, based on the metric system, and imperial units (feet, pounds etc.)
SI stands for International System of Units, also known as the metric system. It is a set of standardized units for measuring physical quantities such as length, mass, and time.