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{{Wiktionary|yotta-}}
'''Yotta''' is the largest [[decimal]] [[Unit of measurement|unit]] prefix in the [[metric system]], denoting a factor of [[Orders_of_magnitude (numbers)#1024|10<sup>24</sup>]] or {{gaps|1|000|000|000|000|000|000|000|000}}; that is, one million million million million, or one septillion. It has the unit symbol '''Y'''. The prefix name is derived from the [[Ancient Greek]] {{lang|grc|οκτώ}} ({{lang|grc-Latn|októ}}), meaning "eight", because it is equal to 1,000<sup>8</sup>. It was added as an [[SI prefix]] to the [[International System of Units]] (SI) in 1991.<ref>{{cite web|url=http://www.bipm.org/en/CGPM/db/19/4/|title=Resolution 4 of the 19th CGPM (Conférence Générale des Poids et Mesures)|publisher=BIPM (Bureau International des Poids et Mesures)
}}</ref>
Usage examples:
*The mass of the [[Earth]] is 5,972.6 Yg.<ref name="Earth fact sheet">{{cite web|last1=Williams|first1=David R.|title=Earth fact sheet|url=http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html|website=Earth fact sheet|publisher=NASA|accessdate=31 October 2015|ref=2}}</ref>
*The mass of the [[ocean]]s is about 1.4 Yg.<ref>{{cite book
| first=Michael J. | last=Kennish | year=2001
| title=Practical handbook of marine science
| page=35 | edition=3rd | publisher=CRC Press
| series=Marine science series | isbn=0-8493-2391-6 }}</ref>
*The total power output of the [[Sun]] is approximately 385 YW.<ref>{{cite web|url=http://www.wolframalpha.com/|title=Wolfram-Alpha: Making the world’s knowledge computable|website=www.wolframalpha.com}}</ref>
*The [[observable universe]] is estimated to be 880 Ym in diameter.<ref>http://www.wolframalpha.com/input/?i=size+of+universe By a simple units conversion, 8.8×10<sup>23</sup>km = 8.8×10<sup>26</sup>m = 880×10<sup>24</sup>m = 880 Ym</ref>
*One [[yottabyte]] (YB) is a unit of digital information or information storage capacity that contains one septillion bytes or 1,000 [[zettabyte]]s. The [[yobibyte]] (YiB) is a related unit that uses a [[binary prefix]], and means 1,024<sup>8</sup> bytes, which is approximately 1.2 septillion bytes.
==Related pages==
*[[Metric prefix]]
*[[Googol]]
==References==
{{reflist}}
==Other websites==
{{Wiktionary|yotta-}}
*[http://www.bipm.org/en/home/ BIPM website]
[[Category:SI units]]
'''Yotta''' is the largest [[decimal]] [[Unit of measurement|unit]] prefix in the [[metric system]], denoting a factor of [[Orders_of_magnitude (numbers)#1024|10<sup>24</sup>]] or {{gaps|1|000|000|000|000|000|000|000|000}}; that is, one million million million million, or one septillion. It has the unit symbol '''Y'''. The prefix name is derived from the [[Ancient Greek]] {{lang|grc|οκτώ}} ({{lang|grc-Latn|októ}}), meaning "eight", because it is equal to 1,000<sup>8</sup>. It was added as an [[SI prefix]] to the [[International System of Units]] (SI) in 1991.<ref>{{cite web|url=http://www.bipm.org/en/CGPM/db/19/4/|title=Resolution 4 of the 19th CGPM (Conférence Générale des Poids et Mesures)|publisher=BIPM (Bureau International des Poids et Mesures)
}}</ref>
Usage examples:
*The mass of the [[Earth]] is 5,972.6 Yg.<ref name="Earth fact sheet">{{cite web|last1=Williams|first1=David R.|title=Earth fact sheet|url=http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html|website=Earth fact sheet|publisher=NASA|accessdate=31 October 2015|ref=2}}</ref>
*The mass of the [[ocean]]s is about 1.4 Yg.<ref>{{cite book
| first=Michael J. | last=Kennish | year=2001
| title=Practical handbook of marine science
| page=35 | edition=3rd | publisher=CRC Press
| series=Marine science series | isbn=0-8493-2391-6 }}</ref>
*The total power output of the [[Sun]] is approximately 385 YW.<ref>{{cite web|url=http://www.wolframalpha.com/|title=Wolfram-Alpha: Making the world’s knowledge computable|website=www.wolframalpha.com}}</ref>
*The [[observable universe]] is estimated to be 880 Ym in diameter.<ref>http://www.wolframalpha.com/input/?i=size+of+universe By a simple units conversion, 8.8×10<sup>23</sup>km = 8.8×10<sup>26</sup>m = 880×10<sup>24</sup>m = 880 Ym</ref>
*One [[yottabyte]] (YB) is a unit of digital information or information storage capacity that contains one septillion bytes or 1,000 [[zettabyte]]s. The [[yobibyte]] (YiB) is a related unit that uses a [[binary prefix]], and means 1,024<sup>8</sup> bytes, which is approximately 1.2 septillion bytes.
==Related pages==
*[[Metric prefix]]
*[[Googol]]
==References==
{{reflist}}
==Other websites==
{{Wiktionary|yotta-}}
*[http://www.bipm.org/en/home/ BIPM website]
[[Category:SI units]]