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Page title without namespace (page_title ) | 'Kilo-' |
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Old page wikitext, before the edit (old_wikitext ) | '{{Other uses|Kilo (disambiguation)}}
{{Wiktionary|kilo-}}
'''Kilo''' is a [[decimal prefix|decimal]] [[metric prefix|unit prefix]] in the [[metric system]] denoting multiplication by one [[thousand]] (10<sup>3</sup>). It is used in the [[International System of Units]], where it has the symbol '''k''', in lower case.
The prefix ''kilo'' is derived from the [[Greek language|Greek]] word {{lang|el|χίλιοι}} ({{lang|el-Latn|chilioi}}), meaning "thousand". It was originally adopted by [[Antoine Lavoisier]]'s research group in 1795, and introduced into the metric system in France with its establishment in 1799.
In 19th century English it was sometimes spelled chilio, in line with a [[Linguistic purism|puristic]] opinion by [[Thomas Young (scientist)|Thomas Young]].<ref name="Brewster_1832">{{cite book|title=The Edinburgh Encyclopaedia|first=David|last=Brewster|volume=12|edition=1st American|date=1832|publisher=Joseph and Edward Parker<!-- |printer=William Brows -->|url=https://books.google.com/books?id=17RGAQAAIAAJ&pg=PA572&lpg=PA572|accessdate=2015-10-09}}</ref><ref name="Dingler_1823">{{cite book|title=Polytechnisches Journal|first=Johann Gottfried|last=Dingler|volume=11|date=1823|publisher=J.W. Gotta'schen Buchhandlung|language=German|location=Stuttgart, Germany|url=https://books.google.com/books?id=wF3zAAAAMAAJ&pg=PA500&lpg=PA500|accessdate=2015-10-09}}</ref>
== Examples ==
* one [[kilogram]] (kg) is 1000 [[gram]]s
* one [[kilometre]] (km) is 1000 [[metre]]s
* one [[kilojoule]] (kJ) is 1000 [[joule]]s
* one kilolitre (kL) is 1000 [[litre]]s
* one kilobaud (kBd) is 1000 [[baud]]
* one kilohertz (kHz) is 1000 [[hertz]]
* one [[kilobit]] (kb) is 1000 [[bit]]s
* one [[kilobyte]] (kB) is 1000 [[byte]]s
* one kiloohm is (kΩ) is 1000 [[ohm]]s
* one [[kilosecond]] (ks) is 1000 [[Second|seconds]]
By extension, currencies are also sometimes preceded by the prefix kilo-:
* one kiloeuro (k€) is 1000 [[euros]]
* one kilodollar (k$) is 1000 [[dollars]]
==kilobyte==
For the kilobyte, a second definition has been in common use in some fields of [[computer science]] and information technology. It uses ''kilobyte'' to mean 2<sup>10</sup> bytes (= 1024 bytes), because of the [[Mathematical coincidence#Concerning base 2|mathematical coincidence]] that 2<sup>10</sup> is approximately 10<sup>3</sup>. The reason for this application is that digital hardware and architectures natively use [[base 2]] exponentiation, and not [[base 10|decimal]] systems. [[JEDEC memory standards]] still permit this definition, but acknowledge the correct SI usage.
NIST comments on the confusion caused by these contrasting definitions: "Faced with this reality, the ''IEEE Standards Board'' decided that IEEE standards will use the conventional, internationally adopted, definitions of the SI prefixes", instead of kilo for 1024.<ref>[http://physics.nist.gov/cuu/Units/binary.html Definition of binary prefixes at NIST]</ref> To address this conflict, a new set of [[binary prefix]]es has been introduced, which is based on powers of 2. Therefore, 1024 bytes are defined as one [[kibibyte]] (1 KiB).
==Exponentiation==
When units occur in [[exponentiation]], such as in square and cubic forms, any multiplier prefix is considered part of the unit, and thus included in the exponentiation.
* 1 km<sup>2</sup> means one square kilometre or the area of a [[Square (geometry)|square]] that measures 1000 m on each side or 10<sup>6</sup> m<sup>2</sup> (as opposed to 1000 square meters, which is the area of a square that measures 31.6 m on each side).
* 1 km<sup>3</sup> means one cubic kilometre or the volume of a [[cube]] that measures 1000 m on each side or 10<sup>9</sup> m<sup>3</sup> (as opposed to 1000 cubic meters, which is the volume of a cube that measures 10 m on each side).
==See also==
* [[milli-]] (inverse of kilo- prefix, denoting a factor of 1/1000)
* [[kibi-]] (binary prefix, denoting a factor of 1024)
* [[RKM code]]
==References==
{{reflist}}
{{SI prefixes (infobox)}}
[[Category:SI prefixes]]
[[Category:1000 (number)]]
[[he:תחיליות במערכת היחידות הבינלאומית#קילו]]' |
New page wikitext, after the edit (new_wikitext ) | 'up>). i}}), meaning lpg=PA500|accessdate=2015-10-09}}</ref>
== Examples ==
* one [[kilogram]] (kg) is 1000 [[gram]]s
* one [[kilometre]] (km) is 1000 [[metre]]s
* one [[kilojoule]] (kJ) is 1000 [[joule]]s
* one kilolitre (kL) is 1000 [[litre]]s
* one kilobaud (kBd) is 1000 [[baud]]
* one kilohertz (kHz) is 1000 [[hertz]]
* one [[kilobit]] (kb) is 1000 [[bit]]s
* one [[kilobyte]] (kB) is 1000 [[byte]]s
* one kiloohm is (kΩ) is 1000 [[ohm]]s
* one [[kilosecond]] (ks) is 1000 [[Second|seconds]]
By extension, currencies are also sometimes preceded by the prefix kilo-:
* one kiloeuro (k€) is 1000 [[euros]]
* one kilodollar (k$) is 1000 [[dollars]]
==kilobyte==
For the kilobyte, a second definition has been in common use in some fields of [[computer science]] and information technology. It uses ''kilobyte'' to mean 2<sup>10</sup> bytes (= 1024 bytes), because of the [[Mathematical coincidence#Concerning base 2|mathematical coincidence]] that 2<sup>10</sup> is approximately 10<sup>3</sup>. The reason for this application is that digital hardware and architectures natively use [[base 2]] exponentiation, and not [[base 10|decimal]] systems. [[JEDEC memory standards]] still permit this definition, but acknowledge the correct SI usage.
NIST comments on the confusion caused by these contrasting definitions: "Faced with this reality, the ''IEEE Standards Board'' decided that IEEE standards will use the conventional, internationally adopted, definitions of the SI prefixes", instead of kilo for 1024.<ref>[http://physics.nist.gov/cuu/Units/binary.html Definition of binary prefixes at NIST]</ref> To address this conflict, a new set of [[binary prefix]]es has been introduced, which is based on powers of 2. Therefore, 1024 bytes are defined as one [[kibibyte]] (1 KiB).
==Exponentiation==
When units occur in [[exponentiation]], such as in square and cubic forms, any multiplier prefix is considered part of the unit, and thus included in the exponentiation.
* 1 km<sup>2</sup> means one square kilometre or the area of a [[Square (geometry)|square]] that measures 1000 m on each side or 10<sup>6</sup> m<sup>2</sup> (as opposed to 1000 square meters, which is the area of a square that measures 31.6 m on each side).
* 1 km<sup>3</sup> means one cubic kilometre or the volume of a [[cube]] that measures 1000 m on each side or 10<sup>9</sup> m<sup>3</sup> (as opposed to 1000 cubic meters, which is the volume of a cube that measures 10 m on each side).
==See also==
* [[milli-]] (inverse of kilo- prefix, denoting a factor of 1/1000)
* [[kibi-]] (binary prefix, denoting a factor of 1024)
* [[RKM code]]
==References==
{{reflist}}
{{SI prefixes (infobox)}}
[[Category:SI prefixes]]
[[Category:1000 (number)]]
[[he:תחיליות במערכת היחידות הבינלאומית#קילו]]' |
Unified diff of changes made by edit (edit_diff ) | '@@ -1,10 +1,3 @@
-{{Other uses|Kilo (disambiguation)}}
-{{Wiktionary|kilo-}}
-
-'''Kilo''' is a [[decimal prefix|decimal]] [[metric prefix|unit prefix]] in the [[metric system]] denoting multiplication by one [[thousand]] (10<sup>3</sup>). It is used in the [[International System of Units]], where it has the symbol '''k''', in lower case.
-
-The prefix ''kilo'' is derived from the [[Greek language|Greek]] word {{lang|el|χίλιοι}} ({{lang|el-Latn|chilioi}}), meaning "thousand". It was originally adopted by [[Antoine Lavoisier]]'s research group in 1795, and introduced into the metric system in France with its establishment in 1799.
-
-In 19th century English it was sometimes spelled chilio, in line with a [[Linguistic purism|puristic]] opinion by [[Thomas Young (scientist)|Thomas Young]].<ref name="Brewster_1832">{{cite book|title=The Edinburgh Encyclopaedia|first=David|last=Brewster|volume=12|edition=1st American|date=1832|publisher=Joseph and Edward Parker<!-- |printer=William Brows -->|url=https://books.google.com/books?id=17RGAQAAIAAJ&pg=PA572&lpg=PA572|accessdate=2015-10-09}}</ref><ref name="Dingler_1823">{{cite book|title=Polytechnisches Journal|first=Johann Gottfried|last=Dingler|volume=11|date=1823|publisher=J.W. Gotta'schen Buchhandlung|language=German|location=Stuttgart, Germany|url=https://books.google.com/books?id=wF3zAAAAMAAJ&pg=PA500&lpg=PA500|accessdate=2015-10-09}}</ref>
+up>). i}}), meaning lpg=PA500|accessdate=2015-10-09}}</ref>
== Examples ==
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