{ bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_mpuslot' }}, { bidder: 'openx', params: { unit: '539971070', delDomain: 'idm-d.openx.net' }}, That was a surprise. { bidder: 'sovrn', params: { tagid: '446385' }}, {code: 'ad_contentslot_4', pubstack: { adUnitName: 'cdo_mpuslot', adUnitPath: '/2863368/mpuslot' }, mediaTypes: { banner: { sizes: [[300, 250], [320, 100], [320, 50], [300, 50]] } }, { bidder: 'ix', params: { siteId: '195453', size: [320, 50] }}, centimetre cm Spellzone course content. { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_mpuslot_flex' }}, { bidder: 'openx', params: { unit: '541042770', delDomain: 'idm-d.openx.net' }}, },{ meter. Learn more. { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, const customGranularity = { { bidder: 'appnexus', params: { placementId: '11654157' }}, { bidder: 'ix', params: { siteId: '194852', size: [300, 250] }}, 'min': 0, [55][56][57] This uncertainty is currently one limiting factor in laboratory realisations of the metre, and it is several orders of magnitude poorer than that of the second, based upon the caesium fountain atomic clock (U = 5×10−16). { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot2_flex' }}, { bidder: 'sovrn', params: { tagid: '446381' }}, googletag.pubads().collapseEmptyDivs(false); bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776130', position: 'btf' }}, [29][32][33], "The unit of length to which all distances measured in the Coast Survey are referred is the French metre, an authentic copy of which is preserved in the archives of the Coast Survey Office. { bidder: 'ix', params: { siteId: '555365', size: [300, 250] }}, { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_rightslot2_flex' }}, { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_rightslot2' }}, Metre is the official spelling of the measurement, meter is the american spelling of it/. en_AU (Australia) is under en_001, and counts as "metre", while en_US is not under en_001 and counts as "meter". For other uses of "metre" or "meter", see, Seal of the International Bureau of Weights and Measures (BIPM) – Use measure (Greek: ΜΕΤΡΩ ΧΡΩ), From smallest to largest (left to right). { bidder: 'openx', params: { unit: '539971063', delDomain: 'idm-d.openx.net' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776358', position: 'atf' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_btmslot' }}]}, { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumferenceis approximately 40000 km. [53], To further reduce uncertainty, the 17th CGPM in 1983 replaced the definition of the metre with its current definition, thus fixing the length of the metre in terms of the second and the speed of light:[54]. [36], In 1867 at the second general conference of the International Association of Geodesy held in Berlin, the question of an international standard unit of length was discussed in order to combine the measurements made in different countries to determine the size and shape of the Earth. var mapping_leftslot = googletag.sizeMapping().addSize([1063, 0], [[120, 600], [160, 600], [300, 600]]).addSize([963, 0], [[120, 600], [160, 600]]).addSize([0, 0], []).build(); { bidder: 'ix', params: { siteId: '195451', size: [300, 250] }}, You have several of them at home – a water meter, a gas meter and an electricity meter. params: { googletag.pubads().setTargeting("cdo_pc", "dictionary"); In 1926, although Webster's New International Dictionary gave the alternative spellings meter and metre for music and poetry, this edition still gave the word for a length-measuring { bidder: 'appnexus', params: { placementId: '11654156' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_mpuslot3' }}]}, "authorizationFallbackResponse": { bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162050', zoneId: '776342', position: 'btf' }}, { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, {code: 'ad_rightslot2', pubstack: { adUnitName: 'cdo_rightslot2', adUnitPath: '/2863368/rightslot2' }, mediaTypes: { banner: { sizes: [[300, 250], [120, 600], [160, 600]] } }, [55] For the purpose of delineating the metre, the BIPM currently considers the HeNe laser wavelength, λHeNe, to be 632.99121258 nm with an estimated relative standard uncertainty (U) of 2.1×10−11. [52], In 1893, the standard metre was first measured with an interferometer by Albert A. Michelson, the inventor of the device and an advocate of using some particular wavelength of light as a standard of length. googletag.pubads().setTargeting("cdo_l", "en"); { bidder: 'sovrn', params: { tagid: '387232' }}, The meter itself is in perfect condition it was only the leather case that had gone a bit moth eaten. { bidder: 'appnexus', params: { placementId: '19042093' }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776142', position: 'btf' }}, It is the property of the American Philosophical Society, to whom it was presented by Mr. Hassler, who had received it from Tralles, a member of the French Committee charged with the construction of the standard metre by comparison with the toise, which had served as unit of length in the measurement of the meridional arcs in France and Peru. 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