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Zepto-

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(September 2014) ()
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Zepto (unit symbol z) is a unit prefix in the metric system denoting a factor of 10−21, i.e.0.000000000000000000001.

Adopted into the International System of Units (SI) in 1991, it is derived from the Latin septem, seven, since it is equal to 1000−7.

Examples of its use:

Prefix Base 10 Decimal English word Adoption Etymology
Name Symbol Short scale Long scale Language Derived word
yotta Y 1024 1000000000000000000000000 septillion quadrillion 1991 Greek eight
zetta Z 1021 1000000000000000000000 sextillion trilliard 1991 Latin seven
exa E 1018 1000000000000000000 quintillion trillion 1975 Greek six
peta P 1015 1000000000000000 quadrillion billiard 1975 Greek five
tera T 1012 1000000000000 trillion billion 1960 Greek four, 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 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
femto f 10−15 0.000000000000001 quadrillionth billiardth 1964 Danish fifteen, Fermi
atto a 10−18 0.000000000000000001 quintillionth trillionth 1964 Danish eighteen
zepto z 10−21 0.000000000000000000001 sextillionth trilliardth 1991 Latin seven
yocto y 10−24 0.000000000000000000000001 septillionth quadrillionth 1991 Greek eight
  1. Prefixes adopted before 1960 already existed before SI. The introduction of the CGS system was in 1873.
  2. Part of the beginning of the prefix was modified from the word it was derived from, ex: "peta" (prefix) vs "penta" (derived word).
  3. The fermi was introduced earlier with the same symbol "fm", in which then the "f" became a prefix. The Danish word is used since it is vaguely spelled similar to fermi.
  1. John Dell BE PhD (2009-03-25). "Mechanical engineering gone small - how to measure Zeptograms and Yoctograms using MEMS technology"(PDF). University of Western Australia. Engineers Australia. Retrieved2020-05-14.
  2. [https://science.sciencemag.org/content/370/6514/339 Zeptosecond birth time delay in molecular photoionization.
  3. [https://www.sciencenewsforstudents.org/article/photon-journey-molecule-shortest-event-zeptosecond-physics Physicists have clocked the shortest time span ever. It's how long it took a chunk of light to cross a hydrogen molecule]

Zepto-
Zepto Language Watch Edit This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Zepto news newspapers books scholar JSTOR September 2014 Learn how and when to remove this template message Look up zepto in Wiktionary the free dictionary Zepto unit symbol z is a unit prefix in the metric system denoting a factor of 10 21 i e 0 000000 000 000 000 000 001 Adopted into the International System of Units SI in 1991 it is derived from the Latin septem seven since it is equal to 1000 7 Examples of its use The electric charge on one electron is 160 217657 zeptocoulombs zC One zeptomole zmol of a substance contains 602 particles The human insulin molecule has a mass of roughly 10 zeptograms zg 1 The travel time of a photon across molecular hydrogen is 247 zeptoseconds zs for the average bond length of molecular hydrogen 2 3 SI prefixesvte Prefix Base 10 Decimal English word Adoption nb 1 EtymologyName Symbol Short scale Long scale Language Derived wordyotta Y 1024 1000 000 000 000 000 000 000 000 septillion quadrillion 1991 Greek eight nb 2 zetta Z 1021 1000 000 000 000 000 000 000 sextillion trilliard 1991 Latin seven nb 2 exa E 1018 1000 000 000 000 000 000 quintillion trillion 1975 Greek sixpeta P 1015 1000 000 000 000 000 quadrillion billiard 1975 Greek five nb 2 tera T 1012 1000 000 000 000 trillion billion 1960 Greek four nb 2 monstergiga G 109 1000 000 000 billion milliard 1960 Greek giantmega M 106 1000 000 million 1873 Greek greatkilo k 103 1000 thousand 1795 Greek thousandhecto h 102 100 hundred 1795 Greek hundreddeca da 101 10 ten 1795 Greek ten100 1 one deci d 10 1 0 1 tenth 1795 Latin tencenti c 10 2 0 01 hundredth 1795 Latin hundredmilli m 10 3 0 001 thousandth 1795 Latin thousandmicro m 10 6 0 000001 millionth 1873 Greek smallnano n 10 9 0 000000 001 billionth milliardth 1960 Greek dwarfpico p 10 12 0 000000 000 001 trillionth billionth 1960 Spanish peakfemto f 10 15 0 000000 000 000 001 quadrillionth billiardth 1964 Danish fifteen Fermi nb 3 atto a 10 18 0 000000 000 000 000 001 quintillionth trillionth 1964 Danish eighteenzepto z 10 21 0 000000 000 000 000 000 001 sextillionth trilliardth 1991 Latin seven nb 2 yocto y 10 24 0 000000 000 000 000 000 000 001 septillionth quadrillionth 1991 Greek eight nb 2 Prefixes adopted before 1960 already existed before SI The introduction of the CGS system was in 1873 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 derived word The fermi was introduced earlier with the same symbol fm in which then the f became a prefix The Danish word is used since it is vaguely spelled similar to fermi References Edit John Dell BE PhD 2009 03 25 Mechanical engineering gone small how to measure Zeptograms and Yoctograms using MEMS technology PDF University of Western Australia Engineers Australia Retrieved 2020 05 14 https science sciencemag org content 370 6514 339 Zeptosecond birth time delay in molecular photoionization https www sciencenewsforstudents org article photon journey molecule shortest event zeptosecond physics Physicists have clocked the shortest time span ever It s how long it took a chunk of light to cross a hydrogen molecule Retrieved from https en wikipedia org w index php title Zepto amp oldid 1021239919, wikipedia, wiki, book,

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