The hectare ( / ˈ h ɛ k t ɛər , - t ɑːr / ; SI symbol: ha ) is a non-SI metric unit of area equal to a square with 100- metre sides (1 hm ), that is, 10,000 square metres (10,000 m ), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is about 0.405 hectares and one hectare contains about 2.47 acres.
18-1180: [REDACTED] Look up ha , HA , Ha , or hA in Wiktionary, the free dictionary. Ha may refer to: Agencies and organizations [ edit ] Health authority , a former type of administrative organisation of the NHS in England and Wales Hells Angels Motorcycle Club Highways Agency (renamed Highways England , now National Highways ), UK government body maintaining England's major roads Homelessness Australia , peak body organisation for homeless people and services Homosexuals Anonymous an ex-gay program for dealing with unwanted same-sex attractions Hong Kong Housing Authority Arts, entertainment, and media [ edit ] Ha (Doseone album) , 2005 Ha (Talvin Singh album) , 2002 Ha! (Killing Joke album) , 1982 "Ha" (song) , by Juvenile Ha! (TV channel) , an American all-comedy TV channel Hamar Arbeiderblad ,
36-679: A dash ; for example, 1-21-00.26 ha would mean 1 hectare, 21 ares, and 0.26 centiares (12,100.26 m ). The metric system of measurement was first given a legal basis in 1795 by the French Revolutionary government. The law of 18 Germinal, Year III (7 April 1795) defined five units of measure: In 1960, when the metric system was updated as the International System of Units (SI), the are did not receive international recognition. The International Committee for Weights and Measures ( CIPM ) makes no mention of
54-404: A double prefix is non-standard. The decimilliare is (100 mm) or roughly a four-inch-by-four-inch square. The centiare is one square metre. The deciare (rarely used) is ten square metres. The are ( / ɑːr / or / ɛər / ) is a unit of area, equal to 100 square metres ( 10 m × 10 m ), used for measuring land area. It was defined by older forms of the metric system , but
72-714: A Norwegian newspaper Human Action , a book by the Austrian economist Ludwig von Mises The Jim Henson Company , formerly known as ha! Language [ edit ] Ha (Javanese) (ꦲ), a letter in the Javanese script Ha (kana) , in syllabic Japanese script ه ( hāʾ ), ح ( ḥāʾ ), or خ ( ḫāʾ ), Arabic letters Ha language , the language of the Ha people in eastern Africa Hausa language , ISO 639-1 code HA Places [ edit ] Ha, Bhutan Hå , Norway Ha Gorge , Greece HA postcode area ,
90-439: A few other units including the are (and implicitly the hectare ) whose use was limited to the measurement of land. The names centiare , deciare , decare and hectare are derived by adding the standard metric prefixes to the original base unit of area, the are . The decimilliare (dma, sometimes seen in cadastre area evaluation of real estate plots) is 1 ⁄ 10,000 are or one square decimetre. Such usage of
108-607: A group of English postal districts in north-west London Henan , a province of China (Guobiao abbreviation HA) Science and technology [ edit ] Chemistry [ edit ] Hahnium , an element now called Dubnium Hyaluronan (Hyaluronic acid) , a carbohydrate structure Hydroxylapatite , a mineral Medicine [ edit ] Hyperandrogenic anovulation , also called polycystic ovary syndrome Health anxiety (HA) or hypochondriasis (hypochondria) Hemagglutinin (influenza) (HA), an antigenic glycoprotein from Influenza viruses Hemagglutination assay ,
126-595: A locomotive (classified type HA under the Southern Region's pre-TOPS scheme) Hawaiian Airlines (IATA designator HA) Highways Agency (now National Highways ), UK government body maintaining England's major roads Other uses [ edit ] Ha (mythology) Ha, one of deities Heng and Ha Ha people , a Tanzanian people Hospitalman Apprentice , a U.S. Navy rank See also [ edit ] Haa (disambiguation) Haha (disambiguation) Has (disambiguation) Topics referred to by
144-550: A measure of land area. The names of the older land measures of similar size are usually used, redefined as exactly one decare: The most commonly used units are in bold . One hectare is also equivalent to: The Unicode character U+33CA ㏊ SQUARE HA , in the CJK Compatibility block, is intended for compatibility with pre-existing East Asian character codes. It is not intended for use in alphabetic contexts. U+3336 ㌶ SQUARE HEKUTAARU
162-410: A measurement of viruses or bacteria Units of measure [ edit ] Hartree , an atomic unit of energy Hectare (ha), a unit of area Hectoampere , a unit of electric current Other uses in science and technology [ edit ] ha (function prefix) (half), a prefix for some trigonometric functions in mathematics High availability , systems design and implementation with
180-669: A unit of SI, is the only named unit of area that is accepted for use with SI units . The name was coined in French, from the Latin ārea . In practice the hectare is fully derived from the SI, being equivalent to a square hectometre. It is widely used throughout the world for the measurement of large areas of land, and it is the legal unit of measure in domains concerned with land ownership, planning, and management , including law ( land deeds ), agriculture, forestry , and town planning throughout
198-723: A view to maximising service Hour angle , in astronomy, one of the coordinates of the equatorial coordinate system H a , or alternative hypothesis , in statistical testing H-alpha (Hα), a deep-red visible spectral line of the hydrogen atom Surnames [ edit ] Ha (Chinese surname) ( 哈 ), found in the Hundred Family Surnames Ha (Korean surname) ( 하 , 河 or 夏) Hà , Vietnamese surname Xia (surname) ( 夏 ), romanized as Ha in Cantonese, Korean and Vietnamese pronunciation Transportation [ edit ] British Rail Class 71 ,
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#1732765322698216-520: Is different from Wikidata All article disambiguation pages All disambiguation pages ha">ha The requested page title contains unsupported characters : ">". Return to Main Page . Hectare In 1795, when the metric system was introduced, the are was defined as 100 square metres , or one square decametre , and the hectare (" hecto- " + "are") was thus 100 ares or 1 ⁄ 100 km (10,000 square metres). When
234-456: Is now outside the modern International System of Units (SI). It is still commonly used in speech to measure real estate, in particular in Indonesia, India, and in various European countries. In Russian and some other languages of the former Soviet Union , the are is called sotka (Russian: сотка : 'a hundred', i.e. 100 m or 1 ⁄ 100 hectare). It is used to describe
252-1151: The European Union , New Zealand and Australia (since 1970). However, the United Kingdom, the United States, Myanmar (Burma), and to some extent Canada, use the acre instead of the hectare for measuring surface or land area. Some countries that underwent a general conversion from traditional measurements to metric measurements (e.g. Canada) required a resurvey when units of measure in legal descriptions relating to land were converted to metric units. Others, such as South Africa, published conversion factors which were to be used particularly "when preparing consolidation diagrams by compilation". In many countries, metrification redefined or clarified existing measures in terms of metric units. The following legacy units of area have been redefined as being equal to one hectare: In Mexico, land area measurements are commonly given as combinations of hectares, ares, and centiares. These are commonly written separated by
270-593: The are in the 2019 edition of the SI brochure, but classifies the hectare as a "Non-SI unit accepted for use with the International System of Units". In 1972, the European Economic Community (EEC) passed directive 71/354/EEC, which catalogued the units of measure that might be used within the Community. The units that were catalogued replicated the recommendations of the CGPM, supplemented by
288-584: The metric system was further rationalised in 1960, resulting in the International System of Units ( SI ), the are was not included as a recognised unit. The hectare, however, remains as a non-SI unit accepted for use with the SI and whose use is "expected to continue indefinitely". Though the dekare/decare daa (1,000 m ) and are (100 m ) are not officially "accepted for use", they are still used in some contexts. The hectare ( / ˈ h ɛ k t ɛər , - t ɑː r / ), although not
306-447: The same term [REDACTED] This disambiguation page lists articles associated with the title Ha . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Ha&oldid=1237809060 " Category : Disambiguation pages Hidden categories: Articles containing Korean-language text Short description
324-595: The size of suburban dacha or allotment garden plots or small city parks where the hectare would be too large. Many Russian dachas are 6 ares in size (in Russian, шесть соток ). The decare or dekare ( / ˈ d ɛ k ɑːr , - ɛər / ) is derived from deca and are , and is equal to 10 ares or 1000 square metres. It is used in Norway and in the former Ottoman areas of the Middle East and Bulgaria as
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