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