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 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.

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).
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.

SI prefixes
Prefix		Base 10	Decimal	English word		Adoption[nb 1]	Etymology
Name	Symbol	Base 10	Decimal	Short scale	Long scale	Adoption[nb 1]	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	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 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	Latin	eight[nb 2]
Prefixes adopted before 1960 already existed before SI. The introduction of the CGS system was in 1873. Part of the beginning of the prefix was modified from the word it was derived from, ex: "peta" (prefix) vs "penta" (source word). 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 due to its similarity.

References

"Resolution 4 of the 19th CGPM (1991)". Retrieved 2022-04-22.
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

BIPM website

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[6] Prefixes adopted before 1960 already existed before SI. The introduction of the CGS system was in 1873.

[similar-7] Part of the beginning of the prefix was modified from the word it was derived from, ex: "peta" (prefix) vs "penta" (source word).

[8] 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 due to its similarity.

[1] "Resolution 4 of the 19th CGPM (1991)". Retrieved 2022-04-22.

[Williams2016-2] 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] ttp://physics.nist.gov/cgi-bin/cuu/Value?na

[5] Richard Wray (2009-05-18). "Internet data heads for 500bn gigabytes". The Guardian.

Zetta-

See also

References

External links