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From Wikipedia, the free encyclopedia

Exa is a decimal unit prefix in the metric system denoting 1018 or 1000000000000000000. It was added as an SI prefix to the International System of Units (SI) in 1975,[1] and has the unit symbol E.

Exa comes from the ancient Greek ἕξ héx, used as a prefix ἑξά- hexá-, meaning six (like hexa-), because it is equal to 10006.

Examples:

SI prefixes
Prefix Base 10 Decimal English word Adoption[nb 1] Etymology
Name Symbol Short scale Long scale Language Derived word
yotta Y  1024 1000000000000000000000000  septillion  quadrillion 1991 Greek 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  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, beak, little bit
femto f  10−15 0.000000000000001  quadrillionth  billiardth 1964 Danish fifteen
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 Greek 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" (derived word).

See also

References

  1. ^ "Resolution 10 of the 15th meeting of the CGPM (1975)". International Bureau of Weights and Measures. Retrieved 2012-04-18.
  2. ^ distance × sin( diameter_angle ), using distance of 5 kpc (15.8 ± 1.1 kly) and angle 36.3', = 172 ± 12.5 ly.
  3. ^ van de Ven, G.; van den Bosch, R. C. E.; Verolme, E. K.; de Zeeuw, P. T. (January 2006). "The dynamical distance and intrinsic structure of the globular cluster ω Centauri". Astronomy and Astrophysics. 445 (2): 513–543. arXiv:astro-ph/0509228. Bibcode:2006A&A...445..513V. doi:10.1051/0004-6361:20053061. best-fit dynamical distance D=4.8±0.3 kpc ... consistent with the canonical value 5.0±0.2 kpc obtained by photometric methods
  4. ^ "Total Hash Rate". blockchain.com. Retrieved 2021-01-21.
  5. ^ Bright, Peter (2019-05-07). "Cray, AMD to build 1.5 exaflops supercomputer for US government". Ars Technica. Retrieved 2019-05-29.

External links

This page was last edited on 25 January 2021, at 23:16
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