Zetta-
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 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:
- The mass of Earth's atmosphere is approximately five zettagrams (Zg).[2]
- The volume of seawater in the Earth's oceans is approximately 1.369 zettalitres (ZL).[3]
- The Avogadro constant is 602.2 Zmol−1.[4]
- The diameter of the Milky Way Galaxy is estimated to be between 0.9 and 1.7 zettametres (Zm).[citation needed]
- As of 2009, the World Wide Web was estimated to comprise nearly half a zettabyte (ZB) of data.[5] The zebibyte (ZiB), a related unit that uses a binary prefix, represents 10247 bytes.
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 |
femto | f | 10−15 | 0.000000000000001 | quadrillionth | billiardth | 1964 | Danish | fifteen, Fermi[nb 3] |
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] |
|
See also[]
- Metric prefix
- Zettascale computing
References[]
- ^ "Resolution 4 of the 19th CGPM (Conférence Générale des Poids et Mesures)". BIPM (Bureau International des Poids et Mesures). Retrieved 2009-05-16.
Les noms zepto et zetta évoquent le chiffre sept (septième puissance de 103) et la lettre « z » remplace la lettre « s » pour éviter le double emploi de la lettre « s » comme symbole.
- ^ Williams, David R. (December 16, 2016), Earth Fact Sheet, NASA Goddard Space Flight Center, retrieved 2018-01-21.
- ^ Qadri, Syed; Erra, Ketsia (2001). Elert, Glenn (ed.). "Volume of earth's oceans". The Physics Factbook. Retrieved 2019-07-28.
- ^ http://physics.nist.gov/cgi-bin/cuu/Value?na
- ^ Richard Wray (2009-05-18). "Internet data heads for 500bn gigabytes". The Guardian.
External links[]
Look up zetta- in Wiktionary, the free dictionary. |
Categories:
- SI prefixes