{"id":44290,"date":"2019-05-20T14:35:31","date_gmt":"2019-05-20T07:35:31","guid":{"rendered":"http:\/\/tcvn.gov.vn\/?p=44290"},"modified":"2019-05-20T14:35:31","modified_gmt":"2019-05-20T07:35:31","slug":"hom-nay-dinh-nghia-1kg-se-duoc-tinh-bang-anh-sang","status":"publish","type":"post","link":"https:\/\/tcvn.gov.vn\/hom-nay-dinh-nghia-1kg-se-duoc-tinh-bang-anh-sang\/20\/05\/2019\/","title":{"rendered":"H\u00f4m nay, \u0111\u1ecbnh ngh\u0129a 1kg s\u1ebd \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng \u00e1nh s\u00e1ng"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\"><strong>H\u00f4m nay 20\/5, kh\u00f4ng ch\u1ec9 l\u00e0 ng\u00e0y \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf \u0111o l\u01b0\u1eddng (World Metrology Day) m\u00e0 c\u00f2n s\u1ebd c\u1ed9t m\u1ed1c \u0111\u00e1nh d\u1ea5u s\u1ef1 ki\u1ec7n: kh\u00e1i ni\u1ec7m 1kg s\u1ebd ho\u00e0n to\u00e0n thay \u0111\u1ed5i so v\u1edbi nh\u1eefng g\u00ec m\u00e0 ch\u00fang ta bi\u1ebft trong 130 n\u0103m qua.<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\">T\u1eeb x\u01b0a, kh\u00e1i ni\u1ec7m kg \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1eb1ng m\u1ed9t kh\u1ed1i h\u1ee3p kim platinum-iridium h\u00ecnh tr\u1ee5, g\u1ecdi l\u00e0\u00a0<strong>Le Grand K<\/strong>\u00a0v\u00e0 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 trong m\u1ed9t c\u0103n h\u1ea7m \u1edf ngo\u1ea1i \u00f4 Paris. Tuy nhi\u00ean, c\u1ee9 m\u1ed7i l\u1ea7n c\u00e1c nh\u00e0 khoa h\u1ecdc x\u1eed l\u00fd th\u00ec kh\u1ed1i tr\u1ee5 n\u00e0y l\u1ea1i b\u1ecb m\u1ea5t \u0111i c\u00e1c nguy\u00ean t\u1eed v\u00e0 \u01b0\u1edbc t\u00ednh \u0111\u00e3 m\u1ea5t \u0111i t\u1ed5ng c\u1ed9ng 50 micro gram. Do \u0111\u00f3, b\u1eaft \u0111\u1ea7u t\u1eeb h\u00f4m nay, c\u00e1c nh\u00e0 khoa h\u1ecdc quy\u1ebft \u0111\u1ecbnh ch\u00ednh th\u1ee9c\u00a0<strong>\u0111\u1ecbnh ngh\u0129a 1 kg b\u1eb1ng h\u1eb1ng s\u1ed1 Planck<\/strong>.<\/span><\/p>\n<p style=\"text-align: center;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\"><img loading=\"lazy\" class=\"lightbox aligncenter\" src=\"https:\/\/i.khoahoc.tv\/photos\/image\/2019\/05\/20\/don-vi-do-luong.jpg\" alt=\"\u0110\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng\" width=\"639\" height=\"386\" data-i=\"0\" \/><\/span><br \/>\n<em><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\">V\u00e0o h\u00f4m nay, b\u00ean c\u1ea1nh 1kg th\u00ec \u0111\u1ecbnh ngh\u0129a 1 ampere, kelvin v\u00e0 mole c\u0169ng s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p m\u1edbi.<\/span><\/em><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\">Tr\u00ean th\u1ef1c t\u1ebf, kh\u00f4ng ph\u1ea3i mu\u1ed1n \u0111\u1ed5i th\u00ec \u0111\u1ed5i. C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 m\u1ea5t r\u1ea5t nhi\u1ec1u n\u0103m \u0111\u1ec3 nghi\u00ean c\u1ee9u nh\u1eb1m chu\u1ea9n b\u1ecb chuy\u1ec3n \u0111\u1ed5i m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd nh\u1ea5t. V\u00e0o h\u00f4m nay, b\u00ean c\u1ea1nh 1kg th\u00ec \u0111\u1ecbnh ngh\u0129a 1 ampere, kelvin v\u00e0 mole c\u0169ng s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1eb1ng ph\u01b0\u01a1ng ph\u00e1p m\u1edbi. C\u00e1c nh\u00e0 khoa h\u1ecdc cho bi\u1ebft t\u1ea5t c\u1ea3 thay \u0111\u1ed5i \u0111\u1ec1u s\u1ebd d\u1ec5 d\u00e0ng c\u1eadp nh\u1eadt do kh\u00f4ng ph\u1ee5 thu\u1ed9c qu\u00e1 nhi\u1ec1u v\u00e0o nh\u1eefng kh\u00e1i ni\u1ec7m x\u01b0a c\u0169.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\">Chi ti\u1ebft h\u01a1n, 1kg \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a m\u1edbi s\u1ebd l\u00e0 t\u1ed5ng kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t s\u1ed1 l\u01b0\u1ee3ng photon c\u1ee5 th\u1ec3 c\u1ee7a m\u1ed9t b\u01b0\u1edbc s\u00f3ng c\u1ee5 th\u1ec3. V\u1edbi s\u1ef1 thay \u0111\u1ed5i n\u00e0y, kg s\u1ebd \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh theo 2 \u0111\u1ea1i l\u01b0\u1ee3ng l\u00e0 gi\u00e2y v\u00e0 m\u00e9t, v\u1ed1n \u0111\u1ec1u l\u00e0 nh\u1eefng h\u1eb1ng s\u1ed1 v\u1eadt l\u00fd v\u00e0 do \u0111\u00f3, s\u1ebd \u0111\u00e1ng tin c\u1eady h\u01a1n so v\u1edbi m\u1ed9t v\u1eadt th\u1ec3 nh\u00e2n t\u1ea1o nh\u01b0 kh\u1ed1i tr\u1ee5 h\u1ee3p kim.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\">\u0110\u1ed1i v\u1edbi anh em ng\u01b0\u1eddi d\u00f9ng b\u00ecnh th\u01b0\u1eddng ch\u00fang ta th\u00ec s\u1ef1 thay \u0111\u1ed5i n\u00e0y s\u1ebd kh\u00f4ng qu\u00e1 quan tr\u1ecdng, tuy nhi\u00ean \u0111\u1ed1i v\u1edbi c\u1ed9ng \u0111\u1ed3ng khoa h\u1ecdc th\u00ec \u0111\u00f3 s\u1ebd l\u00e0 m\u1ed9t s\u1ef1 ki\u1ec7n l\u1ecbch s\u1eed. N\u00f3 s\u1ebd cho c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u m\u1ed9t c\u00f4ng c\u1ee5 ch\u00ednh x\u00e1c h\u01a1n r\u1ea5t nhi\u1ec1u \u0111\u1ec3 ti\u1ebfn h\u00e0nh c\u00e1c ph\u00e9p \u0111o \u0111\u1ea1c, t\u1eeb \u0111\u00f3 c\u00f3 th\u1ec3 t\u00e1i kh\u1eb3ng \u0111\u1ecbnh c\u00e1c \u0111\u1ecbnh lu\u1eadt v\u1eadt l\u00fd.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\">Terry Quinn, gi\u00e1m \u0111\u1ed1c danh d\u1ef1 c\u1ee7a C\u1ee5c \u0111o l\u01b0\u1eddng v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng qu\u1ed1c t\u1ebf BIPM, cho bi\u1ebft:\u00a0<em>\u201c\u0110\u00e2y l\u00e0 quy\u1ebft \u0111\u1ecbnh quan tr\u1ecdng nh\u1ea5t m\u00e0 BIPM \u0111\u00e3 \u0111\u01b0a ra trong v\u00f2ng 100 n\u0103m qua. Nghe c\u00f3 v\u1ebb h\u01a1i c\u01b0\u1eddng \u0111i\u1ec7u nh\u01b0ng c\u00f3 l\u1ebd l\u00e0 s\u1ef1 ki\u1ec7n quan tr\u1ecdng nh\u1ea5t, \u00edt ra l\u00e0 t\u1eeb 1960, khi ng\u01b0\u1eddi ta ch\u1ea5p nh\u1eadn h\u1ec7 th\u1ed1ng \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf&#8221;.<\/em><\/span><\/p>\n<p style=\"text-align: right;\"><span style=\"font-family: arial, helvetica, sans-serif; font-size: 10pt;\"><em>TH<\/em><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u00f4m nay 20\/5, kh\u00f4ng ch\u1ec9 l\u00e0 ng\u00e0y \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf \u0111o l\u01b0\u1eddng (World Metrology Day) m\u00e0 c\u00f2n s\u1ebd c\u1ed9t m\u1ed1c \u0111\u00e1nh d\u1ea5u s\u1ef1 ki\u1ec7n: kh\u00e1i ni\u1ec7m 1kg s\u1ebd ho\u00e0n to\u00e0n thay \u0111\u1ed5i so v\u1edbi nh\u1eefng g\u00ec m\u00e0 ch\u00fang ta bi\u1ebft trong 130 n\u0103m qua. T\u1eeb x\u01b0a, kh\u00e1i ni\u1ec7m kg \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1eb1ng m\u1ed9t [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":44291,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[59,30,27],"tags":[],"acf":{"linh-vuc":"\u0110o l\u01b0\u1eddng"},"_links":{"self":[{"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/posts\/44290"}],"collection":[{"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/comments?post=44290"}],"version-history":[{"count":0,"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/posts\/44290\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/media\/44291"}],"wp:attachment":[{"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/media?parent=44290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/categories?post=44290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tcvn.gov.vn\/wp-json\/wp\/v2\/tags?post=44290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}