yotta-


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yotta (symbol Y) is a prefix in the International System of Units (SI) denoting a factor of 1024 or 1000000000000000000000000.

Added to the SI in 1991, it is derived from the Greek ὀκτώ (októ), meaning eight, because it is equal to 10008.

As of 2009, yotta is the largest and last confirmed SI prefix.

Examples:

  • the mass of the Earth is 5973.6 Yg (although as large mass units are based on the tonne, this would be more likely expressed as 5.97 Zt).
  • the total power output of the Sun is approximately 383 YW.
  • the total data storage capacity produced by humans each year is expected to surpass 1 Yottabyte (1024 bytes) by 2013.[1]
  • the known universe is estimated to be 880 Ym in diameter.
SI prefixes
1000m 10n Prefix Symbol Since[1] Short scale Long scale Decimal
10008 1024 yotta Y 1991 Septillion Quadrillion 1000000000000000000000000
10007 1021 zetta Z 1991 Sextillion Trilliard 1000000000000000000000
10006 1018 exa E 1975 Quintillion Trillion 1000000000000000000
10005 1015 peta P 1975 Quadrillion Billiard 1000000000000000
10004 1012 tera T 1960 Trillion Billion 1000000000000
10003 109 giga G 1960 Billion Milliard 1000000000
10002 106 mega M 1960 Million 1 000 000
10001 103 kilo k 1795 Thousand 1000
10002⁄3 102 hecto h 1795 Hundred 100
10001⁄3 101 deca da 1795 Ten 10
10000 100 (none) (none) NA One 1
1000−1⁄3 10−1 deci d 1795 Tenth 0.1
1000−2⁄3 10−2 centi c 1795 Hundredth 0.01
1000−1 10−3 milli m 1795 Thousandth 0.001
1000−2 10−6 micro µ 1960[2] Millionth 0.000001
1000−3 10−9 nano n 1960 Billionth Milliardth 0.000000001
1000−4 10−12 pico p 1960 Trillionth Billionth 0.000000000001
1000−5 10−15 femto f 1964 Quadrillionth Billiardth 0.000000000000001
1000−6 10−18 atto a 1964 Quintillionth Trillionth 0.000000000000000001
1000−7 10−21 zepto z 1991 Sextillionth Trilliardth 0.000000000000000000001
1000−8 10−24 yocto y 1991 Septillionth Quadrillionth 0.000000000000000000000001
  1. The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.
  2. The 1948 recognition of the micron by the CGPM was abrogated in 1967.

See also

References

  1. ^ "HP brings storage, servers into one rack". Computerworld. 2009-05-03. http://www.computerworld.com/action/article.do?command=viewArticleBasic&taxonomyName=storage&articleId=9083198&taxonomyId=19&intsrc=kc_top. Retrieved on 2008-05-06. 

External links

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