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Hecto-
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{{Short description|Prefix denoting a factor of 100}} {{Wiktionary|hecto-}} '''''Hecto''''' (symbol: '''h''') is a [[decimal prefix|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 language|Greek]] {{lang|grc|ἑκατόν}} {{lang|grc-Latn|hekatón}}, meaning "hundred". In 19th century English it was sometimes spelled "hecato", in line with a [[Linguistic purism|puristic]] opinion by [[Thomas Young (scientist)|Thomas Young]].<ref name="Brewster_1832">{{cite book|title=The Edinburgh Encyclopaedia|first=David|last=Brewster|volume=12|edition=1st American|date=1832|publisher=Joseph and Edward Parker<!-- |printer=William Brows -->|url=https://books.google.com/books?id=17RGAQAAIAAJ&pg=PA572|access-date=2015-10-09}}</ref><ref name="Dingler_1823">{{cite book|title=Polytechnisches Journal|first=Johann Gottfried|last=Dingler|volume=11|date=1823|publisher=J.W. Gotta'schen Buchhandlung|language=de|location=Stuttgart, Germany|url=https://books.google.com/books?id=wF3zAAAAMAAJ&pg=PA500|access-date=2015-10-09}}</ref> 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). * [[Kilogram#SI multiples|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 {{lang|it|etto}}, and in Canada, New Zealand and Sweden simply as 100 g, for retail sale of [[cold cut]]s and meat. * [[hectometre]] (hm), in [[radio astronomy]], occasionally used to indicate a [[Radio frequency|radio]] [[band (radio)|band]] by [[wavelength]] * In [[surveying]], a square hectometre is called a [[hectare]] (ha, or 100 ''[[Hectare#Are|ares]]'' = 1 hm<sup>2</sup> = 10,000 m<sup>2</sup>). {{SI prefixes (infobox)}} ==See also== * [[Metric prefix]] * [[Numeral prefix]] ==References== {{reflist}} [[Category:SI prefixes]] [[Category:100 (number)]]
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