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34-644: Max Bog is a 10.6 hectare biological Site of Special Scientific Interest in North Somerset , notified in 1988. The site is owned by North Somerset Council and managed by the Avon Wildlife Trust for the range of wetland plants that it supports. There is no access without a permit. Marsh Helleborine occurs here and nowhere else in Avon . Lesser Butterfly-orchid and Fragrant Orchid also occur here, and at only one other Avon site each. It

68-679: 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

102-404: 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

136-681: A stock corporation . The BIPM is the organisation, the CGPM is the general meeting of the shareholders, the CIPM is the board of directors appointed by the CGPM, and the staff at the site in Saint-Cloud perform the day-to-day work. The CGPM recognises two classes of membership – full membership for those states that wish to participate in the activities of the BIPM and associate membership for those countries or economies that only wish to participate in

170-564: A different nationality. elected by the General Conference on Weights and Measures (CGPM) whose principal task is to promote worldwide uniformity in units of measurement by taking direct action or by submitting proposals to the CGPM. The CIPM meets every year (since 2011 in two sessions per year) at the Pavillon de Breteuil where, among other matters, it discusses reports presented to it by its Consultative Committees. Reports of

204-439: 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

238-550: 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

272-463: A member of the CIPM. Apart from the CCU, membership of a CC is open to National Metrology Institutes ( NMIs ) of Member States that are recognized internationally as most expert in the field. NMIs from Member States that are active in the field, but lack the expertise to become Members, are able to attend CC meetings as observers. These committees are: The CCU's role is to advise on matters related to

306-460: A permanent laboratory and secretariat function (sometimes referred to as the Headquarters), the activities of which include the establishment of the basic standards and scales of the principal physical quantities and maintenance of the international prototype standards. The CGPM acts on behalf of the governments of its members. In so doing, it elects members to the CIPM, receives reports from

340-614: Is a combination of ヘクタール ( hekutāru ), the Japanese translation of "hectare". International Committee for Weights and Measures The General Conference on Weights and Measures (abbreviated CGPM from the French : Conférence générale des poids et mesures ) is the supreme authority of the International Bureau of Weights and Measures (BIPM), the intergovernmental organization established in 1875 under

374-416: Is also home to Yellow Rattle , Meadow Sweet and Meadow Thistle . The reserve is also important for its invertebrate interest and is home to many species of moth , grasshopper and dragonfly . Narrow-leaved Marsh-orchid is found in adjacent fields. Dactylorhiza orchids are well represented, including the hybrids D. × grandis and D. × hallii . Hectare In 1795, when the metric system

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408-456: 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

442-513: The International system of units . The brochure is produced by the CCU in conjunction with a number of other international organisations. Initially the brochure was only in French – the official language of the metre convention, but recent versions have been published simultaneously in both English and French, with the French text being the official text. The 6th edition was published in 1991,

476-708: The Président de l'Académie des Sciences de Paris . Of the twenty countries that attended the Conference of the Metre in 1875, representatives of seventeen signed the convention on 20 May 1875. In April 1884, H. J. Chaney, Warden of Standards in London unofficially contacted the BIPM inquiring whether the BIPM would calibrate some metre standards that had been manufactured in the United Kingdom. Broch , director of

510-590: 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

544-1115: The 21st meeting of the CGPM in October 1999, the category of "associate" was created for states not yet BIPM members and for economic unions . Albania (2007) Azerbaijan (2015) Bangladesh (2010) Bolivia (2008) Bosnia and Herzegovina (2011) Botswana (2012) Cambodia (2021) Caribbean Community (2005) Chinese Taipei (2002) Ethiopia (2018) Georgia (2008) Ghana (2009) Hong Kong (2000) Jamaica (2003) Kuwait (2018) Latvia (2001) Luxembourg (2014) Malta (2001) Mauritius (2010) Moldova (2007) Mongolia (2013) Namibia (2012) North Macedonia (2006) Oman (2012) Panama (2003) Paraguay (2009) Peru (2009) Philippines (2002) Qatar (2016) Sri Lanka (2007) Syria (2012) Tanzania (2018) Uzbekistan (2018) Vietnam (2003) Zambia (2010) Zimbabwe (2010–2020, 2022) Cuba (2000–2021) Seychelles (2010–2021) Sudan (2014–2021) The International Committee for Weights and Measures consists of eighteen persons, each of

578-1930: The BIPM replied that he was not authorised to perform any such calibrations for non-member states. On 17 September 1884, the British Government signed the convention on behalf of the United Kingdom. This number grew to 21 in 1900, 32 in 1950, and 49 in 2001. As of 18 November 2022 , there are 64 Member States and 36 Associate States and Economies of the General Conference (with year of partnership in parentheses): Argentina (1877) Australia (1947) Austria (1875) Belarus (2020) Belgium (1875) Brazil (1921) Bulgaria (1911) Canada (1907) Chile (1908) China (1977) Colombia (2012) Costa Rica (2022) Croatia (2008) Czech Republic (1922) Denmark (1875) Ecuador (2019) Egypt (1962) Estonia (2021) Finland (1913) France (1875) Germany (1875) Greece (2001) Hungary (1925) India (1880) Indonesia (1960) Iran (1975) Iraq (2013) Ireland (1925) Israel (1985) Italy (1875) Japan (1885) Kazakhstan (2008) Kenya (2010) Lithuania (2015) Malaysia (2001) Mexico (1890) Montenegro (2018) Morocco (2019) Netherlands (1929) New Zealand (1991) Norway (1875) Pakistan (1973) Poland (1925) Portugal (1876) Romania (1884) Russia (1875) Saudi Arabia (2011) Serbia (2001) Singapore (1994) Slovakia (1922) Slovenia (2016) South Africa (1964) South Korea (1959) Spain (1875) Sweden (1875) Switzerland (1875) Thailand (1912) Tunisia (2012) Turkey (1875) Ukraine (2018) United Arab Emirates (2015) United Kingdom (1884) United States (1878) Uruguay (1908) Cameroon (1970–2012) Dominican Republic (1954–2015) North Korea (1982–2012) Peru (1875–1956) Venezuela (1879–1907, 1960–2018) At

612-668: The CGPM took place from 18 to 20 November 2014, the 26th meeting of the CGPM took place in Versailles from 13 to 16 November 2018, and the 27th meeting of the CGPM took place from 15 to 18 November 2022. On 20 May 1875 an international treaty known as the Convention du Mètre ( Metre Convention ) was signed by 17 states. This treaty established an international organisation, the Bureau international des poids et mesures (BIPM), which has two governing organs: The organization has

646-490: The CIPM MRA program. Associate members have observer status at the CGPM. Since all formal liaison between the convention organisations and national governments is handled by the member state's ambassador to France, it is implicit that member states must have diplomatic relations with France, though during both world wars, nations that were at war with France retained their membership of the CGPM. CGPM meetings are chaired by

680-463: The CIPM include: From time to time the CIPM has been charged by the CGPM to undertake major investigations related to activities affecting the CGPM or the BIPM. Reports produced include: The Blevin Report , published in 1998, examined the state of worldwide metrology. The report originated from a resolution passed at the 20th CGPM (October 1995) which committed the CIPM to study and report on

714-410: The CIPM which it passes on to the governments and national laboratories on member states, examines and where appropriate approves proposals from the CIPM in respect of changes to the International System of Units (SI), approves the budget for the BIPM (over €13 million in 2018) and it decides all major issues concerning the organization and development of the BIPM. The structure is analogous to that of

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748-585: 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 the European Union , New Zealand and Australia (since 1970). However,

782-409: 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 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

816-946: 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

850-416: The development of the SI and the preparation of the SI brochure. It has liaison with other international bodies such as International Organization for Standardization (ISO) , International Astronomical Union (IAU) , International Union of Pure and Applied Chemistry (IUPAC) , International Union of Pure and Applied Physics (IUPAP) and International Commission on Illumination (CIE) . Official reports of

884-637: The long-term national and international needs relating to metrology, the appropriate international collaborations and the unique role of the BIPM to meet these needs, and the financial and other commitments that will be required from the Member States in the coming decades. The report identified, amongst other things, a need for closer cooperation between the BIPM and other organisations such as International Organization of Legal Metrology (OIML) and International Laboratory Accreditation Cooperation (ILAC) with clearly defined boundaries and interfaces between

918-614: The meetings of the CGPM, the CIPM, and all the Consultative Committees, are published by the BIPM. The secretariat is based in Saint-Cloud , Hauts-de-Seine , France . In 1999, the CIPM has established the CIPM Arrangement de reconnaissance mutuelle (Mutual Recognition Arrangement, MRA), which serves as the framework for the mutual acceptance of national measurement standards and for recognition of

952-415: The organisations. Another major finding was the need for cooperation between accreditation laboratories and the need to involve developing countries in the world of metrology. The Kaarls Report published in 2003 examined the role of the BIPM in the evolving needs for metrology in trade, industry and society. The CIPM has responsibility for commissioning the SI brochure, which is the formal definition of

986-567: The report of the CIPM on work accomplished; it discusses and examines the arrangements required to ensure the propagation and improvement of the International System of Units (SI); it endorses the results of new fundamental metrological determinations and various scientific resolutions of international scope; and it decides all major issues concerning the organization and development of the BIPM, including its financial endowment. The CGPM meets in Paris, usually once every four years. The 25th meeting of

1020-595: 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

1054-484: The supervisory board of the BIPM to direct and supervise it. Initially the work of the BIPM concerned the kilogram and the metre , but in 1921 the scope of the Metre Convention was extended to accommodate all physical measurements and hence all aspects of the metric system . In 1960 the 11th CGPM approved the title International System of Units , usually known as "SI". The General Conference receives

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1088-665: The terms of the Metre Convention through which member states act together on matters related to measurement science and measurement standards . The CGPM is made up of delegates of the governments of the member states and observers from the Associates of the CGPM. It elects the International Committee for Weights and Measures (abbreviated CIPM from the Comité international des poids et mesures ) as

1122-452: The validity of calibration and measurement certificates issued by national metrology institutes. A recent focus area of the CIPM has been the revision of the SI . The CIPM has set up a number of consultative committees (CC) to assist it in its work. These committees are under the authority of the CIPM. The president of each committee, who is expected to take the chair at CC meetings, is usually

1156-505: 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 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

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