Hi\u1ec3u r\u00f5 nguy\u00ean l\u00ed h\u00fat s\u1eaft c\u1ee7a nam ch\u00e2m r\u1ed3i, nh\u01b0ng b\u1ea1n \u0111\u00e3 l\u00e0m th\u1eed th\u00ed nghi\u1ec7m n\u00e0y hay ch\u01b0a: n\u1ebfu nung cho nam ch\u00e2m \u0111\u1ecf h\u1ed3ng l\u00ean, li\u1ec7u n\u00f3 c\u00f3 c\u00f2n h\u00fat \u0111\u01b0\u1ee3c s\u1eaft? C\u00f3 c\u00f2n t\u1eeb t\u00ednh n\u1eefa kh\u00f4ng nh\u1ec9?<\/p>\n\n\n\n
Th\u00ed nghi\u1ec7m cho th\u1ea5y, nam ch\u00e2m sau khi nung \u0111\u1ecf, n\u00f3 li\u1ec1n m\u1ea5t \u0111i t\u1eeb t\u00ednh.<\/p>\n\n\n\n
\u0110\u00f3 l\u00e0 v\u00ec sao v\u1eady?<\/p>\n\n\n\n
Ch\u00fang ta bi\u1ebft r\u1eb1ng, nam ch\u00e2m c\u00f3 t\u1eeb t\u00ednh l\u00e0 v\u00ec b\u00ean trong nam ch\u00e2m c\u00f3 r\u1ea5t nhi\u1ec1u mi\u1ec1n t\u1eeb \u0111ang s\u1eafp x\u1ebfp h\u00e0ng l\u1ed1i ngay ng\u1eafn theo c\u00f9ng m\u1ed9t h\u01b0\u1edbng. Khi c\u00e1c \u0111inh s\u1eaft \u1edf g\u1ea7n nam ch\u00e2m, b\u1ecb t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m t\u1eeb ho\u00e1, c\u0169ng bi\u1ebfn th\u00e0nh “nam ch\u00e2m nh\u1ecf”, t\u1eeb c\u1ef1c kh\u00e1c nhau c\u1ee7a ch\u00fang h\u00fat nhau, nam ch\u00e2m li\u1ec1n h\u00fat ch\u1eb7t l\u1ea5y \u0111inh.<\/p>\n\n\n\n
Nh\u01b0ng, theo \u0111\u00e0 nhi\u1ec7t \u0111\u1ed9 t\u0103ng cao, chuy\u1ec3n \u0111\u1ed9ng nhi\u1ec7t c\u1ee7a ph\u00e2n t\u1eed trong nam ch\u00e2m t\u0103ng m\u1ea1nh. Khi \u1ea5y, h\u01b0\u1edbng s\u1eafp x\u1ebfp c\u1ee7a mi\u1ec1n t\u1eeb li\u1ec1n kh\u00f4ng quy t\u1eafc, l\u1eafc l\u01b0 sau, tr\u01b0\u1edbc, tr\u00e1i, ph\u1ea3i, t\u1eebng mi\u1ec1n t\u1eeb m\u1ed9t bi\u1ebfn th\u00e0nh t\u1ef1 do t\u1ea3n m\u1ea1n, d\u1ea7n d\u1ea7n ng\u1ea3 v\u1ec1 tr\u1ea1ng th\u00e1i v\u00f4 tr\u1eadt t\u1ef1, k\u1ebft c\u1ee5c d\u1eabn t\u1edbi t\u1eeb t\u00ednh b\u1ecb suy y\u1ebfu. Khi nam ch\u00e2m n\u00f3ng \u0111\u1ecf l\u00ean, nhi\u1ec7t \u0111\u1ed9 t\u0103ng cao \u0111\u1ebfn m\u1ed9t gi\u00e1 tr\u1ecb n\u00e0o \u0111\u00f3, chuy\u1ec3n \u0111\u1ed9ng nhi\u1ec7t c\u1ee7a ph\u00e2n t\u1eed d\u1eef d\u1ed9i l\u00e0m cho mi\u1ec1n t\u1eeb tr\u1edf l\u1ea1i tr\u1ea1ng th\u00e1i ho\u00e0n to\u00e0n v\u00f4 tr\u1eadt t\u1ef1, nam ch\u00e2m li\u1ec1n ho\u00e0n to\u00e0n m\u1ea5t t\u1eeb t\u00ednh. C\u00e1c nh\u00e0 v\u1eadt li\u1ec7u h\u1ecdc g\u1ecdi nhi\u1ec7t \u0111\u1ed9 s\u1eaft t\u1eeb ho\u00e0n to\u00e0n m\u1ea5t t\u1eeb t\u00ednh l\u00e0 “nhi\u1ec7t \u0111\u1ed9 Curie”. Nhi\u1ec7t \u0111\u1ed9 Curie c\u1ee7a s\u1eaft th\u00e9p l\u00e0 769\u00b0C.<\/p>\n\n\n\n
B\u00e2y gi\u1edd b\u1ea1n \u0111\u00e3 hi\u1ec3u v\u00ec sao nam ch\u00e2m nung \u0111\u1ecf kh\u00f4ng h\u00fat \u0111\u01b0\u1ee3c s\u1eaft. C\u00f9ng v\u1edbi nguy\u00ean l\u00ed nh\u01b0 v\u1eady, n\u1ebfu ng\u01b0\u1ee3c l\u1ea1i \u0111\u1ed1t n\u00f3ng cho \u0111inh s\u1eaft \u0111\u1ecf l\u00ean, nam ch\u00e2m c\u0169ng kh\u00f4ng h\u00fat \u0111\u01b0\u1ee3c n\u00f3. Trong nh\u00e0 m\u00e1y luy\u1ec7n th\u00e9p, ng\u01b0\u1eddi ta d\u00f9ng c\u1ea7n c\u1ea9u \u0111i\u1ec7n t\u1eeb nh\u1ea5c nguy\u00ean li\u1ec7u gang v.v. cho v\u00e0o l\u00f2 luy\u1ec7n th\u00e9p, nh\u01b0ng l\u1ea1i kh\u00f4ng sao d\u00f9ng c\u1ea7n c\u1ea9u \u0111i\u1ec7n t\u1eeb \u0111\u1ec3 mang th\u00e9p th\u1ecfi v\u1eeba m\u1edbi s\u1ea3n xu\u1ea5t \u0111i ch\u1ed7 kh\u00e1c. Tr\u00ean c\u1ea7n c\u1ea9u \u0111i\u1ec7n t\u1eeb c\u00f3 m\u1ed9t nam ch\u00e2m \u0111i\u1ec7n r\u1ea5t l\u1edbn. L\u1ee3i d\u1ee5ng nam ch\u00e2m \u0111i\u1ec7n h\u00fat gang t\u1ea5t nhi\u00ean kh\u00f4ng c\u00f3 v\u1ea5n \u0111\u1ec1 g\u00ec, nh\u01b0ng \u0111\u1ed1i v\u1edbi th\u00e9p th\u1ecfi v\u1eeba m\u1edbi \u0111\u00f4ng c\u1ee9ng th\u00ec n\u00f3 \u0111\u00e0nh b\u1ea5t l\u1ef1c. V\u00ec nhi\u1ec7t \u0111\u1ed9 c\u1ee7a th\u00e9p th\u1ecfi l\u00fac \u1ea5y cao t\u1edbi 1400\u00b0C cho d\u00f9 h\u01a1i ngu\u1ed9i \u0111i th\u00ec trong th\u1eddi gian ng\u1eafn c\u0169ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 tr\u00ean ngh\u00ecn \u0111\u1ed9 Celsius, v\u01b0\u1ee3t r\u1ea5t xa nhi\u1ec7t \u0111\u1ed9 Curie c\u1ee7a s\u1eaft th\u00e9p, th\u00e9p th\u1ecfi m\u1ea5t t\u00ednh s\u1eaft t\u1eeb, mi\u1ec1n t\u1eeb b\u00ean trong kh\u00f4ng th\u00e8m \u0111\u1ec3 \u00fd \u0111\u1ebfn t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m \u0111i\u1ec7n, t\u1eebng c\u00e1i t\u1eebng c\u00e1i v\u1eabn r\u1ea5t s\u1ed1ng \u0111\u1ed9ng. Th\u00e9p th\u1ecfi kh\u00f4ng b\u1ecb t\u1eeb tr\u01b0\u1eddng b\u00ean ngo\u00e0i t\u1eeb ho\u00e1, nam ch\u00e2m \u0111i\u1ec7n c\u0169ng \u0111\u00e0nh b\u00f3 tay. Ng\u01b0\u1eddi ta ch\u1ec9 c\u00f2n c\u00e1ch d\u00f9ng b\u00e1nh xe gu\u1ed3ng \u0111\u1ec3 chuy\u1ec3n d\u1ecbch c\u00e1c th\u00e9p th\u1ecfi v\u1eeba m\u1edbi \u0111\u00fac xong.<\/p>\n\n\n\n
Th\u1ef1c ra, ngo\u00e0i nhi\u1ec7t \u0111\u1ed9 cao c\u00f3 th\u1ec3 ph\u00e1 ho\u1ea1i t\u00ednh s\u1eaft t\u1eeb ra, ch\u1ea5n \u0111\u1ed9ng d\u1eef d\u1ed9i, t\u1eeb tr\u01b0\u1eddng cao t\u1ea7n c\u0169ng s\u1ebd l\u00e0m cho t\u1eeb t\u00ednh c\u1ee7a nam ch\u00e2m suy y\u1ebfu ho\u1eb7c m\u1ea5t \u0111i.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Nam ch\u00e2m; Mi\u1ec1n t\u1eeb; Nhi\u1ec7t \u0111\u1ed9 Curie; Nam ch\u00e2m \u0111i\u1ec7n.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Hi\u1ec3u r\u00f5 nguy\u00ean l\u00ed h\u00fat s\u1eaft c\u1ee7a nam ch\u00e2m r\u1ed3i, nh\u01b0ng b\u1ea1n \u0111\u00e3 l\u00e0m th\u1eed th\u00ed nghi\u1ec7m n\u00e0y hay ch\u01b0a: n\u1ebfu nung cho nam ch\u00e2m \u0111\u1ecf h\u1ed3ng l\u00ean, li\u1ec7u n\u00f3 c\u00f3 c\u00f2n h\u00fat \u0111\u01b0\u1ee3c s\u1eaft? C\u00f3 c\u00f2n t\u1eeb t\u00ednh n\u1eefa kh\u00f4ng nh\u1ec9? Th\u00ed nghi\u1ec7m cho th\u1ea5y, nam ch\u00e2m sau khi nung \u0111\u1ecf, n\u00f3 li\u1ec1n m\u1ea5t […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,7],"tags":[],"class_list":["post-5712","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5712","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=5712"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5712\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}