Yotta-

Yotta is the largest unit prefix in the International System of Units (SI) denoting a factor of 10²⁴ or 1000000000000000000000000. It has the unit symbol Y.

The prefix name is derived from the Greek ὀκτώ (októ), meaning eight, because it is equal to 1000⁸. It was added to the SI in 1991.^[1]

Before the official adoption of the yotta prefix, the multiple was also known as otta.^{[citation needed]}

Usage examples:

• The mass of the Earth is 5973.6 Yg (or 5.9736 Zt).^[2][3]
• The total power output of the Sun is approximately 383 YW.^{[citation needed]}
• The known universe is estimated^{[citation needed]} to be 880 Ym in diameter.
• The average power released by the Tsar Bomba was 5.4 YW.^{[citation needed]}

SI prefixes

Prefix	Symbol	1000m	10n	Decimal	Short scale	Long scale	Since[n 1]
yotta	Y	10008	1024	1000000000000000000000000	Septillion	Quadrillion	1991
zetta	Z	10007	1021	1000000000000000000000	Sextillion	Trilliard	1991
exa	E	10006	1018	1000000000000000000	Quintillion	Trillion	1975
peta	P	10005	1015	1000000000000000	Quadrillion	Billiard	1975
tera	T	10004	1012	1000000000000	Trillion	Billion	1960
giga	G	10003	109	1000000000	Billion	Milliard	1960
mega	M	10002	106	1000000	Million		1960
kilo	k	10001	103	1000	Thousand		1795
hecto	h	10002/3	102	100	Hundred		1795
deca	da	10001/3	101	10	Ten		1795
		10000	100	1	One		–
deci	d	1000−1/3	10−1	0.1	Tenth		1795
centi	c	1000−2/3	10−2	0.01	Hundredth		1795
milli	m	1000−1	10−3	0.001	Thousandth		1795
micro	μ	1000−2	10−6	0.000001	Millionth		1960
nano	n	1000−3	10−9	0.000000001	Billionth	Milliardth	1960
pico	p	1000−4	10−12	0.000000000001	Trillionth	Billionth	1960
femto	f	1000−5	10−15	0.000000000000001	Quadrillionth	Billiardth	1964
atto	a	1000−6	10−18	0.000000000000000001	Quintillionth	Trillionth	1964
zepto	z	1000−7	10−21	0.000000000000000000001	Sextillionth	Trilliardth	1991
yocto	y	1000−8	10−24	0.000000000000000000000001	Septillionth	Quadrillionth	1991
^ The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.

See also

• Metric system
• Binary prefix
• Googol

References

1. ^ "Resolution 4 of the 19th CGPM (Conférence Générale des Poids et Mesures)". BIPM (Bureau International des Poids et Mesures). http://www.bipm.org/en/CGPM/db/19/4/. 
2. ^ Williams, David R. (2004-09-01). "Earth Fact Sheet". NASA. http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html. Retrieved 2007-03-17. 
3. ^ http://hypertextbook.com/facts/2002/SamanthaDong2.shtml

External links

• BIPM website