Hecto-

Hecto (symbol: h) is a decimal unit prefix in the metric system denoting a factor of one hundred. It was adopted as a multiplier in 1795, and comes from the Greek ἑκατόν hekatón, meaning "hundred". In 19th century English it was sometimes spelled "hecato", in line with a puristic opinion by Thomas Young.^[1]^[2] Its unit symbol as an SI prefix in the International System of Units (SI) is the lower case letter h.

The prefix is rarely used in general, but has certain specific applications:

hectopascal (hPa), in meteorology, for atmospheric pressure, the modern equivalent of the traditional millibar.
hectolitre (hl or hL), in agriculture, for liquids (notably milk and alcoholic beverages) and bulk commodities (e.g., grain).
hectogram (hg), in agronomy, for quantities of animal feed (hectogram/animal) and for measures of agricultural productivity (hectogram/hectare); also used in Italy abbreviated as etto, and in Canada, New Zealand and Sweden simply as 100 g, for retail sale of cold cuts and meat.
hectometre (hm), in radio astronomy, occasionally used to indicate a radio band by wavelength
In surveying, a square hectometre is called a hectare (ha, or 100 ares = 1 hm² = 10,000 m²).

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

↑ Brewster, David (1832). The Edinburgh Encyclopaedia. 12 (1st American ed.). Joseph and Edward Parker. https://books.google.com/books?id=17RGAQAAIAAJ&pg=PA572. Retrieved 2015-10-09.
↑ Dingler, Johann Gottfried (1823) (in de). Polytechnisches Journal. 11. Stuttgart, Germany: J.W. Gotta'schen Buchhandlung. https://books.google.com/books?id=wF3zAAAAMAAJ&pg=PA500. Retrieved 2015-10-09.

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

[Brewster_1832-1] Brewster, David (1832). The Edinburgh Encyclopaedia. 12 (1st American ed.). Joseph and Edward Parker. https://books.google.com/books?id=17RGAQAAIAAJ&pg=PA572. Retrieved 2015-10-09.

[Dingler_1823-2] Dingler, Johann Gottfried (1823) (in de). Polytechnisches Journal. 11. Stuttgart, Germany: J.W. Gotta'schen Buchhandlung. https://books.google.com/books?id=wF3zAAAAMAAJ&pg=PA500. Retrieved 2015-10-09.

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[nb 1]

Hecto-

See also

References