Zetta (unit symbol prefix Z) is a decimal unit prefix in the metric system denoting a factor of 1021 or 1000000000000000000000. The prefix was added as an SI prefix to the International System of Units (SI) in 1991.

Zetta is derived from the Latin numeral septem 'seven', and represents 10007.[1]

A prefix of the same value, hepta, derived from the Ancient Greek ἑπτά (hepta) 'seven', was informally introduced a few years before the promulgation of zetta, but never received official sanction and is considered obsolete.[citation needed]

Examples:

Prefix Base 10 Decimal English word Adoption[nb 1] Etymology
Name Symbol Short scale Long scale Language Source word
yotta Y 1024 1000000000000000000000000 septillion quadrillion 1991 Latin eight[nb 2]
zetta Z 1021 1000000000000000000000 sextillion trilliard 1991 Latin seven[nb 2]
exa E 1018 1000000000000000000 quintillion trillion 1975 Greek six
peta P 1015 1000000000000000 quadrillion billiard 1975 Greek five[nb 2]
tera T 1012 1000000000000 trillion billion 1960 Greek four,[nb 2] monster
giga G 109 1000000000 billion milliard 1960 Greek giant
mega M 106 1000000 million 1873 Greek great
kilo k 103 1000 thousand 1795 Greek thousand
hecto h 102 100 hundred 1795 Greek hundred
deca da 101 10 ten 1795 Greek ten
100 1 one
deci d 10−1 0.1 tenth 1795 Latin ten
centi c 10−2 0.01 hundredth 1795 Latin hundred
milli m 10−3 0.001 thousandth 1795 Latin thousand
micro μ[nb 3] 10−6 0.000001 millionth 1873 Greek small
nano n 10−9 0.000000001 billionth milliardth 1960 Greek dwarf
pico p 10−12 0.000000000001 trillionth billionth 1960 Spanish peak, a little bit
femto f 10−15 0.000000000000001 quadrillionth billiardth 1964 Danish fifteen, Fermi[nb 4]
atto a 10−18 0.000000000000000001 quintillionth trillionth 1964 Danish eighteen
zepto z 10−21 0.000000000000000000001 sextillionth trilliardth 1991 Latin seven[nb 2]
yocto y 10−24 0.000000000000000000000001 septillionth quadrillionth 1991 Latin eight[nb 2]
  1. ^ Prefixes adopted before 1960 already existed before SI. The introduction of the CGS system was in 1873.
  2. ^ a b c d e f Part of the beginning of the prefix was modified from the word it was derived from, ex: "peta" (prefix) vs "penta" (source word).
  3. ^ The abbreviation mcg is often used in medicine instead of μg to prevent confusion with mg, which can lead to overdoses. A lower case u is often used instead of μ where the latter character is unavailable.
  4. ^ The fermi was introduced earlier with the symbol "fm", which prompted the reinterpretation of the "f" as a prefix to "m", with femto being derived from the Danish word femten.

Zetta-joulesEdit

1018 to 1023

1021 Zetta- (ZJ) 6.9×1021 J Estimated energy contained in the world's natural gas reserves as of 2010[7][8]
7.9×1021 J Estimated energy contained in the world's petroleum reserves as of 2010[7][9]

See alsoEdit

ReferencesEdit

  1. ^ "Resolution 4 of the 19th CGPM (1991)". Retrieved 2022-04-22.
  2. ^ Williams, David R. (December 16, 2016), Earth Fact Sheet, NASA Goddard Space Flight Center, retrieved 2018-01-21.
  3. ^ Qadri, Syed; Erra, Ketsia (2001). Elert, Glenn (ed.). "Volume of earth's oceans". The Physics Factbook. Retrieved 2019-07-28.
  4. ^ "Ocean Heat Content | NASA Global Climate Change".
  5. ^ "CODATA Value: Avogadro constant".
  6. ^ Richard Wray (2009-05-18). "Internet data heads for 500bn gigabytes". The Guardian.
  7. ^ a b "Statistical Review of World Energy 2011" (PDF). BP. Archived from the original (PDF) on 2 September 2011. Retrieved 9 December 2011.
  8. ^ Calculated: "6608.9 trillion cubic feet" => 6608.9×103 billion cubic feet × 0.025 million tonnes of oil equivalent/billion cubic feet × 1×106 tonnes of oil equivalent/million tonnes of oil equivalent × 42×109 J/tonne of oil equivalent = 6.9×1021 J
  9. ^ Calculated: "188.8 thousand million tonnes" => 188.8×109 tonnes of oil × 42×109 J/tonne of oil = 7.9×1021 J

External linksEdit