Sometimes you need a very large, or a very small, amount of a certain unit. One way to deal with that is to use prefixes like kilo, mega, milli, micro, and others.
International System of Units (SI)
si units are based on the metric system system international (French) international system (English)
You can use any of the standard SI prefixes with the standard unit of length, the meter. However, it's more common to use non-SI units: astronomical units, light-years, and parsecs for large distances, especially in astronomy. The largest of these is the parsec; but you can also use metric prefixes with that, e.g., kiloparsec, or megaparsec.
SI is a base 10 standardized system
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In the SI, the usual SI prefixes would be used for smaller units - prefixes such as milli, micro, etc.
SI units of measurements: meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), candela (luminous intensity). Common SI prefixes: kilo- (k, 10^3), mega- (M, 10^6), giga- (G, 10^9), milli- (m, 10^-3), micro- (μ, 10^-6), nano- (n, 10^-9), pico- (p, 10^-12).
liters including all prefixes
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No, "femo" is not a SI prefix. The SI (International System of Units) prefixes are used to denote multiples or fractions of base units in the metric system, such as kilo-, mega-, milli-, etc.
The SI (Systeme International) units for mass is the kilogram. For length, it is the Metre, and for volume, the Litre. Note the system is known as the International System, (SI). The International Bureau for Weights and Measures is located near Paris France, the on their web site they have lots of useful information, including for example, the prefixes for the multiples and sub-multiples. Such as Mega, and micro.
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.
Prefixes are used because it is easier to say "7.45 centimeters" than it is to say "745 times 10 to the negative-4 meters"
SI unis are an International System of Units, a system of physical measurement units based on the metre, kilogram, second, ampere, kelvin, candela, and mole. They come with a set of prefixes which indicate multiplication or division by a power of ten.
For units larger or smaller than the base units, you can use prefixes such as kilo (x 1000), Mega (x 1 million), milli (x 0.001), micro (x 0.000 001), etc.; for a complete list, search the Wikipedia for "SI prefixes".
milliliters, deciliters, litersAnswer:The official SI unit for volume is the cubic meter. Surprisingly, the liter is not the official SI unit of volume, although is is commonly accepted as such and used with metric prefixes.