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A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple ... 10 −12: 0.000 000 000 001: femto: f: 10 −15: 0 ...
A metric prefix myria (abbreviation "my"), for 10,000, was deprecated in 1960. Before the adoption of ronna and quetta for 10 27 and 10 30 and ronto and quecto for 10 −27 and 10 −30 in November 2022, many personal, and sometimes facetious, proposals for additional metric prefixes were formulated.
The metric system is a decimal -based system of measurement. The current international standard for the metric system is the International System of Units (Système international d'unités or SI), in which all units can be expressed in terms of seven base units: the metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and ...
The current version of the SI provides twenty-four metric prefixes that signify decimal powers ranging from 10 −30 to 10 30, the most recent being adopted in 2022. [1] : 143–144 [7] [8] [9] Most prefixes correspond to integer powers of 1000; the only ones that do not are those for 10, 1/10, 100, and 1/100.
The kilogram (kg) is the unit of mass. The ampere (A) is the unit of electric current. The kelvin (K) is the unit of thermodynamic temperature. The mole (mol) is the unit of amount of substance. The candela (cd) is the unit of luminous intensity. The SI also defines 22 derived units and associated symbols:
Hecto (symbol: h) is a decimal unit prefix in the metric system denoting a factor of one hundred. It was adopted as a multiplier in 1795, and comes from the Greek ἑκατόν hekatón, meaning "hundred". In 19th century English it was sometimes spelled "hecato", in line with a puristic opinion by Thomas Young. [1] [2] Its unit symbol as an SI ...
Metric prefixes are defined spanning 10 −30 to 10 30, 60 decimal orders of magnitude which may be used in conjunction with the metric base unit of second. Metric units of time larger than the second are most commonly seen only in a few scientific contexts such as observational astronomy and materials science, although this depends on the author.
Giga-. Giga- ( / ˈɡɪɡə / or / ˈdʒɪɡə /) is a unit prefix in the metric system denoting a factor of a short-scale billion or long-scale milliard (10 9 or 1,000,000,000 ). It has the symbol G . Giga- is derived from the Greek word γίγας ( gígas ), meaning "giant". The Oxford English Dictionary reports the earliest written use of ...