Pico-

Pico (unit symbol p) is a unit prefix in the metric system denoting a factor of one trillionth in the short scale and one billionth in the long scale (0.000000000001); that is, 10⁻¹².

Derived from the Spanish word pico,^[1] (peak, beak, little bit), pico is one of the original twelve prefixes defined in 1960 when the International System of Units (SI) was established.^[2]

Atomic radii range from 28 picometers (pm) for helium to 260 pm for caesium. One picolight-year (ply) is about nine kilometers (six miles).^[3]

Carbon atom has radius of 77 picometers.

SI prefixesv · d · e
Prefix		Base 10	Decimal	English word		Adoption^{[nb 1]}
Name	Symbol	Base 10	Decimal	Short scale	Long scale	Adoption^{[nb 1]}
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
↑ Prefixes adopted before 1960 already existed before SI. 1873 was the introduction of the CGS system.

References

↑ The Concise Oxford Dictionary, Eighth Edition (1990).
↑ "Resolution 12 of the 11th CGPM". International Bureau of Weights and Measures. 1960. https://www.bipm.org/en/CGPM/db/11/12/.
↑ "Understanding Atomic Radius Trends: The 2 Key Principles". https://blog.prepscholar.com/atomic-radius-trend.

simple:Pico-

0.00

(0 votes)

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

[1] The Concise Oxford Dictionary, Eighth Edition (1990).

[2] "Resolution 12 of the 11th CGPM". International Bureau of Weights and Measures. 1960. https://www.bipm.org/en/CGPM/db/11/12/.

[urlUnderstanding_Atomic_Radius_Trends:_The_2_Key_Principles-3] "Understanding Atomic Radius Trends: The 2 Key Principles". https://blog.prepscholar.com/atomic-radius-trend.

[1]

[2]

[3]

[nb 1]

Pico-

See also

References