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The prefix milli-, ... [1] [2] Since 2009, ... When mega and micro were adopted in 1873, there were then three prefixes starting with "m", so it was necessary to use ...
Micro (Greek letter μ, mu, non-italic) is a unit prefix in the metric system denoting a factor of 10 −6 (one millionth). [1] It comes from the Greek word μικρός (mikrós), meaning "small". [2] It is the only SI prefix which uses a character not from the Latin alphabet.
The unit prefixes are always considered to be part of the unit, so that, e.g., in exponentiation, 1 km 2 means one square kilometre, not one thousand square metres, and 1 cm 3 means one cubic centimetre, not one hundredth of a cubic metre. In general, prefixes are used with any metric unit, but may also be used with non-metric units.
milli micro nano pico femto atto zepto yocto ronto quecto; Prefix symbol d c m μ n p f a z y r q Factor 10 0: 10 −1: 10 −2: 10 −3: 10 −6: 10 −9: 10 −12: ...
Milli (symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10 −3). [1] Proposed in 1793, [ 2 ] and adopted in 1795, the prefix comes from the Latin mille , meaning one thousand (the Latin plural is milia ).
For example, 1 and 1.02 are within an order of magnitude. So are 1 and 2, 1 and 9, or 1 and 0.2. However, 1 and 15 are not within an order of magnitude, since their ratio is 15/1 = 15 > 10. The reciprocal ratio, 1/15, is less than 0.1, so the same result is obtained.
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1 000 000 000 000: 10 12: giga G 1 000 000 000: 10 9: mega M 1 000 000: 10 6: kilo k 1 000: 10 3: hecto h 100 10 2: deca da 10 10 1 (none) (none) 1 10 0: deci d 0.1 10 −1: centi c 0.01 10 −2: milli m 0.001 10 −3: micro μ 0.000 001: 10 −6: nano n 0.000 000 001: 10 −9: pico p 0.000 000 000 001: 10 −12