Giga-
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Giga- (/ˈɡɪɡə/ or /ˈdʒɪɡə/) is a unit prefix in the metric system denoting a factor of a short-scale billion or long-scale milliard (109 or 1,000,000,000). It has the symbol G.
Giga- is derived from the Greek word Script error: No such module "Lang". (gígas), meaning "giant". The Oxford English Dictionary reports the earliest written use of giga in this sense to be in the Reports of the IUPAC 14th Conférence Internationale de Chimie in 1947: "The following prefixes to abbreviations for the names of units should be used: G giga 109×."[1] However, it was already used in 1932 by the German organization Verband deutscher Elektrotechniker.[2]
When referring to information units in computing, such as gigabyte, giga may sometimes mean 1073741824 (230); this causes ambiguity. Standards organizations discourage this and use giga- to refer to 109 in this context too.[3][4][non-primary source needed] Gigabit is only rarely used with the binary interpretation of the prefix. The binary prefix gibi has been adopted for 230, while reserving giga exclusively for the metric definition.
Pronunciation
In English, the prefix giga can be pronounced /ˈɡɪɡə/ (a hard g as in giggle), or /ˈdʒɪɡə/ (a soft g as in gigantic, which shares giga's Ancient Greek root).[5] A prominent example of this latter pronunciation is found in the pronunciation of gigawatts in the 1985 film Back to the Future.
According to the American writer Kevin Self, a German committee member of the International Electrotechnical Commission proposed giga as a prefix for 109 in the 1920s, drawing on a verse (evidently "Anto-logie") by the German humorous poet Christian Morgenstern that appeared in the third (1908) edition of his Script error: No such module "Lang". (Gallows Songs).[6][7] This suggests that a hard German Script error: No such module "IPA". was originally intended as the pronunciation. Self was unable to ascertain when the Script error: No such module "IPA". (soft g) pronunciation came into occasional use, but claimed that as of 1995 it had returned to Script error: No such module "IPA". (hard g).[8][9]
In 1998, a poll by the phonetician John C. Wells found that 84% of Britons preferred the pronunciation of gigabyte starting with Script error: No such module "IPA". (as in gig), 9% with Script error: No such module "IPA". (as in jig), 6% with Script error: No such module "IPA". (guy), and 1% with Script error: No such module "IPA". (as in giant).[10]
Common usage
- gigahertz—clock rate of a CPU, for instance, 3 GHz = 3000000000Hz
- gigabit—bandwidth of a network link, for instance, 1 Gbit/s = 1000000000bit/s.
- gigabyte—for instance, for hard disk capacity, 120 GB = 120000000000bytes;
- gigayear or gigaannum—one billion (109) years, sometimes abbreviated Gyr, but the preferred usage is Ga or, for years ago, GA.[11]
Binary prefix
The notation 1 GB represents 1,000,000,000 bytes or, in deprecated usage, 1,073,741,824 (230) bytes. Per IEC 60027-2 A.2 and ISO/IEC 80000 standards, the correct notation of 230 is gibi (symbol Gi).[12] One gibibyte (1 GiB) is 1,073,741,824 bytes or approximately 1.074 GB. Despite international standards, the use of 1 GB = 230 B is widespread. A laptop advertised as having 8 GB has 8,589,934,592 bytes of memory: 8.59×109 B, or 8 GiB. [13]
See also
References
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- ^ Page Module:Citation/CS1/styles.css has no content."giga-, comb. form". Oxford English Dictionary. October 2011.
- ^ Page Module:Citation/CS1/styles.css has no content."Wireless Engineer, 1932, issue 05, p. 252" (PDF). Archived (PDF) from the original on 2022-03-28. Retrieved 2022-03-28.
- ^ Page Module:Citation/CS1/styles.css has no content."§3.1 SI prefixes". The International System of Units (SI) (PDF) (in français and English) (8th ed.). Paris: STEDI Media. 2006. p. 127. ISBN 92-822-2213-6. Archived (PDF) from the original on 2006-08-13. Retrieved 2007-02-25.
[Side note:] These SI prefixes refer strictly to powers of 10. They should not be used to indicate powers of 2 (for example, one kilobit represents 1000 bits and not 1024 bits). The IEC has adopted prefixes for binary powers in the international standard IEC 60027-2: 2005, third edition, Letter symbols to be used in electrical technology — Part 2: Telecommunications and electronics. The names and symbols for the prefixes corresponding to 210, 220, 230, 240, 250, and 260 are, respectively: kibi, Ki; mebi, Mi; gibi, Gi; tebi, Ti; pebi, Pi; and exbi, Ei. Thus, for example, one kibibyte would be written: 1 KiB = 210 B = 1024 B, where B denotes a byte. Although these prefixes are not part of the SI, they should be used in the field of information technology to avoid the incorrect usage of the SI prefixes.
- ^ NIST Guide for the Use of the International System of Units (Appendix D. ref 5)
- ^ Page Module:Citation/CS1/styles.css has no content."SI prefixes and their etymologies". US Metric Association. Retrieved 27 November 2019.
- ^ Page Module:Citation/CS1/styles.css has no content.Morgenstern, Christian (1917). Script error: No such module "Lang". (in Deutsch). Illustrated by Karl Walser (22 ed.). Berlin, Germany: Bruno Cassirer. p. 52 – via Project Gutenberg.
[First four lines:] Script error: No such module "Lang".
[These lines are the only appearance of gig in the book. Script error: No such module "Lang". is German for "giant"; cf. "gigantic".] - ^ Page Module:Citation/CS1/styles.css has no content.Morgenstern, Christian (1963). Gallows Songs: Christian Morgenstern's "Galgenlieder", Bilingual Edition: A Selection. Translated by Knight, Max. University of California Press. pp. 24–25. ISBN 9780520008847. Retrieved 20 February 2016.
[Translation:] Of yore, on earth was dominant / the biggest mammal: the Gig-ant. / ("Gig" is a numeral so vast, / it's been extinct for ages past.)
{{cite book}}: ISBN / Date incompatibility (help) - ^ Page Module:Citation/CS1/styles.css has no content.Self, Kevin (October 1994). "Technically speaking". Spectrum. IEEE: 18.
- ^ Page Module:Citation/CS1/styles.css has no content.Self, Kevin (April 1995). "Technically speaking". Spectrum. IEEE: 16.
- ^ Wells, J. C. (1998). LPD pronunciation preference poll 1998.
- ^ Page Module:Citation/CS1/styles.css has no content.Wilcock, Bruce (July 1967). "Megayear and Gigayear". Nature. 215 (5096): 102–102. doi:10.1038/215102b0. ISSN 1476-4687.
- ^ Page Module:Citation/CS1/styles.css has no content."Definitions of the SI units: The binary prefixes". physics.nist.gov. Retrieved 2023-04-05.
- ^ Page Module:Citation/CS1/styles.css has no content."GB Vs GiB: What's The Difference? - MASV". massive.io. Retrieved 2024-08-08.
External links
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| Prefix | Base 10 | Decimal | Adoption [nb 1] | |
|---|---|---|---|---|
| Name | Symbol | |||
| quetta | Q | 1030 | 1000000000000000000000000000000 | 2022[1] |
| ronna | R | 1027 | 1000000000000000000000000000 | |
| yotta | Y | 1024 | 1000000000000000000000000 | 1991 |
| zetta | Z | 1021 | 1000000000000000000000 | |
| exa | E | 1018 | 1000000000000000000 | 1975[2] |
| peta | P | 1015 | 1000000000000000 | |
| tera | T | 1012 | 1000000000000 | 1960 |
| giga | G | 109 | 1000000000 | |
| mega | M | 106 | 1000000 | 1873 |
| kilo | k | 103 | 1000 | 1795 |
| hecto | h | 102 | 100 | |
| deca | da | 101 | 10 | |
| — | — | 100 | 1 | — |
| deci | d | 10−1 | 0.1 | 1795 |
| centi | c | 10−2 | 0.01 | |
| milli | m | 10−3 | 0.001 | |
| micro | μ | 10−6 | 0.000001 | 1873 |
| nano | n | 10−9 | 0.000000001 | 1960 |
| pico | p | 10−12 | 0.000000000001 | |
| femto | f | 10−15 | 0.000000000000001 | 1964 |
| atto | a | 10−18 | 0.000000000000000001 | |
| zepto | z | 10−21 | 0.000000000000000000001 | 1991 |
| yocto | y | 10−24 | 0.000000000000000000000001 | |
| ronto | r | 10−27 | 0.000000000000000000000000001 | 2022[1] |
| quecto | q | 10−30 | 0.000000000000000000000000000001 | |
| ||||
- ^ a b Page Module:Citation/CS1/styles.css has no content.On the extension of the range of SI prefixes. CGPM. Resolution 3 of the 27th CGPM (2022). BIPM. 18 November 2022. doi:10.59161/cgpm2022res3e. Retrieved 5 February 2023.
- ^ Page Module:Citation/CS1/styles.css has no content."Metric (SI) Prefixes". NIST.
