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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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Q: How many SI units?
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Related questions

How many SI units is the earth?

or Kg equivalent.


What is the unit for measuring foece?

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What are SI units and how do you convert them to metric?

SI and metric are the same units.


SI is an abbreviation for System of Units?

International System of Units (SI)


What are the names for the units of measurement?

Search the Wikipedia for "SI"; there you'll find many of the international units.


What do you call the principal SI units that are used to derive all other SI units?

The principal SI units used to derive all other SI units are the base SI units. These are the units for physical quantities such as length, time, mass, electric current, temperature, amount of substance, and luminous intensity.


How many units are in the SI system and can i see them?

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


Why do scientists use SI units instead of units such as inches and gallons?

most of the world does SI so more people can understand with it in SI units


Why do scientist's use SI units instead of units such as inches and gallons?

most of the world does SI so more people can understand with it in SI units


Are all metric units also system international?

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.


Why are si units so often in science?

SI units are more accurate than English system units


When SI units combine what do they make?

When SI units combine, they create derived SI units that are used to express physical quantities. These derived units are formed by multiplying or dividing the base SI units. Examples include the Newton (kg*m/s^2) for force and the Pascal (N/m^2) for pressure.