Zetta-

Short description: Decimal unit prefix

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:

* 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]
* 337±2 zettajoules increase in the Ocean heat content since modern record-keeping began in 1955 [4]
* The Avogadro constant is 602.2 Zmol−1.[5]
* The diameter of the Milky Way Galaxy is estimated to be between 0.9 and 1.7 zettametres (Zm).[citation needed]
* As of 2009[update], the World Wide Web was estimated to comprise nearly half a zettabyte (ZB) of data.[6] The zebibyte (ZiB), a related unit that uses a binary prefix, represents 10247 bytes.

SI prefixesv * d * e

Prefix  | Base 10  | Decimal | English word  | Adoption[nb 1]

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Name  | Symbol  | Short scale | Long scale
yotta | Y  |  1024 | 1000000000000000000000000 |  septillion  |  quadrillion  | 1991
zetta | Z  |  1021 | 1000000000000000000000 |  sextillion  |  trilliard  | 1991
exa | E  |  1018 | 1000000000000000000 |  quintillion  |  trillion  | 1975
peta | P  |  1015 | 1000000000000000 |  quadrillion  |  billiard  | 1975
tera | T  |  1012 | 1000000000000 |  trillion  |  billion  | 1960
giga | G  |  109 | 1000000000 |  billion  |  milliard  | 1960
mega | M  |  106 | 1000000 |  million  | 1873
kilo | k  |  103 | 1000 |  thousand  | 1795
hecto | h  |  102 | 100  |  hundred  | 1795
deca | da  |  101 | 10  |  ten  | 1795
|  100 | 1  |  one  | –
deci | d  |  10−1 | 0.1  |  tenth  | 1795
centi | c  |  10−2 | 0.01  |  hundredth  | 1795
milli | m  |  10−3 | 0.001  |  thousandth  | 1795
micro | μ  |  10−6 | 0.000001 |  millionth  | 1873
nano | n  |  10−9 | 0.000000001 |  billionth  |  milliardth  | 1960
pico | p  |  10−12 | 0.000000000001 |  trillionth  |  billionth  | 1960
femto | f  |  10−15 | 0.000000000000001 |  quadrillionth  |  billiardth  | 1964
atto | a  |  10−18 | 0.000000000000000001 |  quintillionth  |  trillionth  | 1964
zepto | z  |  10−21 | 0.000000000000000000001 |  sextillionth  |  trilliardth  | 1991
yocto | y  |  10−24 | 0.000000000000000000000001 |  septillionth  |  quadrillionth  | 1991

1. ↑ Prefixes adopted before 1960 already existed before SI. 1873 was the introduction of the CGS system.

## Contents

* 1 Zetta-joules
* 2 See also
* 3 References
* 4 External links

## Zetta-joules

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]

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7.9×1021 J | Estimated energy contained in the world's petroleum reserves as of 2010[7][9]

## See also

* Metric prefix
* Zettascale computing

## References

1. ↑ "Resolution 4 of the 19th CGPM (1991)". https://www.bipm.org/en/committees/cg/cgpm/19-1991/resolution-4.
2. ↑ Williams, David R. (December 16, 2016), Earth Fact Sheet, NASA Goddard Space Flight Center, https://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html, retrieved 2018-01-21.
3. ↑ Qadri, Syed; Erra, Ketsia (2001). "Volume of earth's oceans". in Elert, Glenn. https://hypertextbook.com/facts/2001/SyedQadri.shtml.
4. ↑ "Ocean Heat Content | NASA Global Climate Change". https://climate.nasa.gov/vital-signs/ocean-heat/?fbclid=IwAR1z0a6pkkoPrpZn-6u4HC_UDI3wOyrDRJW0DZguQg2Oyf-bsJLGS0gEdVE.
5. ↑ "CODATA Value: Avogadro constant". http://physics.nist.gov/cgi-bin/cuu/Value?na.
6. ↑ Richard Wray (2009-05-18). "Internet data heads for 500bn gigabytes". The Guardian. https://www.theguardian.com/business/2009/may/18/digital-content-expansion.
7. ↑ 7.0 7.1 "Statistical Review of World Energy 2011". BP. http://www.bp.com/assets/bp_internet/globalbp/globalbp_uk_english/reports_and_publications/statistical_energy_review_2011/STAGING/local_assets/pdf/statistical_review_of_world_energy_full_report_2011.pdf.
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 links

* BIPM website

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