{"id":708360,"date":"2024-08-28T01:00:30","date_gmt":"2024-08-28T00:00:30","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=708360"},"modified":"2024-08-28T01:00:30","modified_gmt":"2024-08-28T00:00:30","slug":"su-gian-no-nhiet-trong-vat-lieu-la-gi","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/su-gian-no-nhiet-trong-vat-lieu-la-gi\/","title":{"rendered":"S\u1ef1 Gi\u00e3n N\u1edf Nhi\u1ec7t Trong V\u1eadt Li\u1ec7u L\u00e0 G\u00ec?"},"content":{"rendered":"<p class=\"sidekick\">S\u1ef1 gi\u00e3n n\u1edf nhi\u1ec7t trong v\u1eadt li\u1ec7u l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u00e1c v\u1eadt li\u1ec7u thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i, \u1ea3nh h\u01b0\u1edfng quan tr\u1ecdng \u0111\u1ebfn nhi\u1ec1u ng\u00e0nh k\u1ef9 thu\u1eadt v\u00e0 s\u1ea3n xu\u1ea5t.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/su_gian_no_nhiet_trong_vat_lieu_la_gi.png\" alt=\"S\u1ef1 Gi\u00e3n N\u1edf Nhi\u1ec7t Trong V\u1eadt Li\u1ec7u L\u00e0 G\u00ec?\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>S\u1ef1 Gi\u00e3n N\u1edf Nhi\u1ec7t Trong V\u1eadt Li\u1ec7u L\u00e0 G\u00ec?<\/h2>\n<p>S\u1ef1 gi\u00e3n n\u1edf nhi\u1ec7t l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u00e1c v\u1eadt li\u1ec7u thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc khi nhi\u1ec7t \u0111\u1ed9 c\u1ee7a ch\u00fang thay \u0111\u1ed5i. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n c\u1ee7a v\u1eadt li\u1ec7u m\u00e0 c\u00e1c k\u1ef9 s\u01b0 v\u00e0 nh\u00e0 v\u1eadt l\u00fd c\u1ea7n ph\u1ea3i quan t\u00e2m, \u0111\u1eb7c bi\u1ec7t trong c\u00e1c \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt v\u00e0 c\u00f4ng nghi\u1ec7p.<\/p>\n<h2>Nguy\u00ean l\u00fd C\u01a1 b\u1ea3n<\/h2>\n<p>Khi m\u1ed9t v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c nung n\u00f3ng, c\u00e1c h\u1ea1t c\u1ee7a n\u00f3 s\u1ebd chuy\u1ec3n \u0111\u1ed9ng nhanh h\u01a1n v\u00e0 t\u00e1ch r\u1eddi ra xa h\u01a1n v\u00ec n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t t\u0103ng l\u00ean. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn s\u1ef1 t\u0103ng k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt li\u1ec7u \u0111\u00f3. Ng\u01b0\u1ee3c l\u1ea1i, khi v\u1eadt li\u1ec7u b\u1ecb l\u00e0m l\u1ea1nh, c\u00e1c h\u1ea1t chuy\u1ec3n \u0111\u1ed9ng ch\u1eadm l\u1ea1i v\u00e0 g\u1ea7n nhau h\u01a1n, g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng co l\u1ea1i.<\/p>\n<h2>C\u00f4ng th\u1ee9c Gi\u00e3n N\u1edf<\/h2>\n<p>S\u1ef1 gi\u00e3n n\u1edf nhi\u1ec7t c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t c\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n:<\/p>\n<p>\u0394L = L<sub>0<\/sub> * \u03b1 * \u0394T<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>\u0394L: S\u1ef1 thay \u0111\u1ed5i chi\u1ec1u d\u00e0i<\/li>\n<li>L<sub>0<\/sub>: Chi\u1ec1u d\u00e0i ban \u0111\u1ea7u c\u1ee7a v\u1eadt li\u1ec7u<\/li>\n<li>\u03b1: H\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u<\/li>\n<li>\u0394T: S\u1ef1 thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9<\/li>\n<\/ul>\n<h2>H\u1ec7 s\u1ed1 Gi\u00e3n N\u1edf Nhi\u1ec7t<\/h2>\n<p>H\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t (\u03b1) l\u00e0 m\u1ed9t gi\u00e1 tr\u1ecb \u0111\u1eb7c tr\u01b0ng cho t\u1eebng lo\u1ea1i v\u1eadt li\u1ec7u v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh qua c\u00e1c th\u00ed nghi\u1ec7m. Gi\u00e1 tr\u1ecb n\u00e0y cho bi\u1ebft m\u1ee9c \u0111\u1ed9 gi\u00e3n n\u1edf c\u1ee7a v\u1eadt li\u1ec7u khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng l\u00ean m\u1ed9t \u0111\u1ed9 Celsius (\u00b0C).<\/p>\n<h2>\u1ee8ng d\u1ee5ng v\u00e0 \u00dd ngh\u0129a<\/h2>\n<p>S\u1ef1 gi\u00e3n n\u1edf nhi\u1ec7t c\u00f3 \u00fd ngh\u0129a r\u1ea5t l\u1edbn trong thi\u1ebft k\u1ebf v\u00e0 s\u1ea3n xu\u1ea5t c\u00e1c s\u1ea3n ph\u1ea9m k\u1ef9 thu\u1eadt. V\u00ed d\u1ee5, c\u1ea7u \u0111\u01b0\u1eddng, \u0111\u01b0\u1eddng ray xe l\u1eeda, v\u00e0 c\u00e1c c\u1ea5u tr\u00fac x\u00e2y d\u1ef1ng ph\u1ea3i \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c s\u1ef1 gi\u00e3n n\u1edf v\u00e0 co l\u1ea1i do thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9. N\u1ebfu kh\u00f4ng t\u00ednh to\u00e1n \u0111\u00fang, s\u1ef1 gi\u00e3n n\u1edf nhi\u1ec7t c\u00f3 th\u1ec3 g\u00e2y ra n\u1ee9t, bi\u1ebfn d\u1ea1ng, ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 ph\u00e1 h\u1ee7y c\u00e1c c\u00f4ng tr\u00ecnh.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Hi\u1ec3u bi\u1ebft v\u1ec1 s\u1ef1 gi\u00e3n n\u1edf nhi\u1ec7t l\u00e0 r\u1ea5t quan tr\u1ecdng trong ng\u00e0nh k\u1ef9 thu\u1eadt nhi\u1ec7t v\u00e0 c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p li\u00ean quan. N\u00f3 gi\u00fap c\u00e1c k\u1ef9 s\u01b0 v\u00e0 nh\u00e0 khoa h\u1ecdc d\u1ef1 \u0111o\u00e1n v\u00e0 ph\u00f2ng ng\u1eeba c\u00e1c v\u1ea5n \u0111\u1ec1 c\u00f3 th\u1ec3 x\u1ea3y ra do s\u1ef1 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt li\u1ec7u khi c\u00f3 s\u1ef1 bi\u1ebfn \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u1ef1 gi\u00e3n n\u1edf nhi\u1ec7t trong v\u1eadt li\u1ec7u l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u00e1c v\u1eadt li\u1ec7u thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i, \u1ea3nh h\u01b0\u1edfng quan tr\u1ecdng \u0111\u1ebfn nhi\u1ec1u ng\u00e0nh k\u1ef9 thu\u1eadt v\u00e0 s\u1ea3n xu\u1ea5t.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 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