The International System of Measurements (SI) or The ...



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|The International System of Measurements (SI) or The Metric System |

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| |In 1960, the Eleventh General Conference on Weights and Measures was held in Paris.  They adopted a universal system of measurement units |

| |called Le Systeme International d'Unites (French), which is a revised version of the metric system.  This International System, or SI, as |

| |it is commonly referred to, is used for commerce and Science around the world.  |

| |    There are seven SI base units.   Everything that is measurable can be measured by these base units, or by units derived from these |

| |bases.  The table below shows the bases, their international symbols, and what they are used to measure. |

| |Table 2.1a SI Base Units |

| |Base Quantity |

| |Name of unit |

| |Symbol |

| | |

| |Length |

| |Meter |

| |m |

| | |

| |Mass |

| |Kilogram |

| |kg |

| | |

| |Time |

| |Second |

| |s |

| | |

| |Electrical  Current |

| |Ampere |

| |A |

| | |

| |Temperature |

| |Kelvin |

| |K |

| | |

| |Amount of Substance |

| |Mole |

| |mol |

| | |

| |Luminous Intensity |

| |Candela |

| |cd |

| | |

| |          Prefixes are used with the base units in order to increase or decrease the value that they represent.  All of the prefixes |

| |represent some factor of 10, and they can be used with any of the SI base units.   Table 1.3 represents some of the most common prefixes, |

| |their symbols, and the number that is used to multiply the base factor by. |

| |Table 2.1 SI Prefixes |

| |Prefix |

| |Symbol |

| |Multiply the base by |

| | |

| |giga |

| |G |

| |1 000 000 000 |

| | |

| |mega |

| |M |

| |1 000 000 |

| | |

| |kilo |

| |k |

| |1000 |

| | |

| |hecto- |

| |h |

| |100 |

| | |

| |deca- |

| |da |

| |10 |

| | |

| |deci- |

| |d |

| |0.1 |

| | |

| |centi |

| |c |

| |0.01 |

| | |

| |milli- |

| |m |

| |0.001 |

| | |

| |micro- |

| |u |

| |0.000 001 |

| | |

| |nano- |

| |n |

| |0.000 000 001 |

| | |

| | |

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