H\u01a1n n\u1eeda th\u1ebf k\u1ef7 tr\u01b0\u1edbc, c\u00e1c ph\u00f3ng vi\u00ean, k\u00fd gi\u1ea3 th\u01b0\u1eddng d\u00f9ng c\u00e1c lo\u1ea1i \u0111\u00e8n ch\u1edbp s\u00e1ng (\u0111\u00e8n flash), nghe m\u1ed9t ti\u1ebfng “t\u00e1ch” l\u00e0 ph\u00e1t ra tia ch\u1edbp s\u00e1ng lo\u00e9 m\u1eaft. B\u1ea5y gi\u1edd “c\u1eeda tr\u1eadp” c\u1ee7a m\u00e1y \u1ea3nh s\u1ebd m\u1edf ra v\u00e0 phim s\u1ebd b\u1eaft \u0111\u01b0\u1ee3c t\u1ed1t h\u00ecnh \u1ea3nh s\u1ef1 v\u1eadt c\u1ea7n ch\u1ee5p \u1ea3nh.<\/p>\n\n\n\n
V\u00e0o th\u1eddi \u0111\u00f3 ng\u01b0\u1eddi ta th\u01b0\u1eddng d\u00f9ng tia s\u00e1ng khi c\u00e1c kim lo\u1ea1i magie ho\u1eb7c nh\u00f4m b\u1ed1c ch\u00e1y ph\u00e1t ra, l\u00e0m \u0111\u00e8n ch\u1edbp s\u00e1ng. C\u00e1c kim lo\u1ea1i magie, nh\u00f4m c\u00f3 m\u00e0u s\u00e1ng b\u1ea1c, nh\u1eb9. Trong \u0111i\u1ec1u ki\u1ec7n b\u00ecnh th\u01b0\u1eddng c\u00e1c kim lo\u1ea1i n\u00e0y kh\u00e1 “\u00eam \u1ea3”, nh\u01b0ng khi ch\u00e1y l\u1ea1i ch\u00e1y r\u1ea5t m\u00e3nh li\u1ec7t. \u0110\u00f3 l\u00e0 do qu\u00e1 tr\u00ecnh oxy ho\u00e1 c\u00e1c kim lo\u1ea1i x\u1ea3y ra r\u1ea5t \u0111\u1eb7c bi\u1ec7t: \u1ede \u0111i\u1ec1u ki\u1ec7n trong kh\u00f4ng kh\u00ed kh\u00f4, c\u00e1c kim lo\u1ea1i h\u1ea7u nh\u01b0 kh\u00f4ng c\u00f3 thay \u0111\u1ed5i g\u00ec. Nh\u01b0ng khi g\u1eb7p nhi\u1ec7t \u0111\u1ed9 cao th\u00ec magie b\u1ed1c ch\u00e1y trong kh\u00f4ng kh\u00ed, t\u1ea1o th\u00e0nh b\u1ed9t magie oxit m\u00e0u tr\u1eafng v\u00e0 to\u1ea3 ra m\u1ed9t l\u01b0\u1ee3ng nhi\u1ec7t r\u1ea5t l\u1edbn, ph\u00e1t ra lu\u1ed3ng \u00e1nh s\u00e1ng tr\u1eafng lo\u00e1 m\u1eaft. Lo\u1ea1i \u00e1nh s\u00e1ng n\u00e0y t\u00e1c d\u1ee5ng l\u00ean phim \u1ea3nh r\u1ea5t m\u1ea1nh, n\u00ean ng\u01b0\u1eddi ta c\u00f3 th\u1ec3 d\u00f9ng ch\u1ee5p \u1ea3nh trong \u0111\u00eam \u0111en. D\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a tia ch\u1edbp s\u00e1ng c\u1ee7a \u0111\u00e8n ch\u1edbp s\u00e1ng, h\u00ecnh \u1ea3nh v\u1eadt ch\u1ee5p \u0111\u01b0\u1ee3c ghi l\u1ea1i r\u00f5 n\u00e9t tr\u00ean phim.<\/p>\n\n\n\n
Nh\u00f4m b\u1ec1n h\u01a1n magie nhi\u1ec1u. H\u1eb1ng ng\u00e0y ch\u00fang ta ch\u1eb3ng \u0111\u00e3 d\u00f9ng xoong n\u1ed3i b\u1eb1ng nh\u00f4m \u0111\u1ec3 n\u1ea5u c\u01a1m, n\u1ea5u th\u1ee9c \u0103n \u0111\u00f3 sao? Nh\u01b0ng khi nh\u00f4m \u0111\u00e3 b\u1ed1c ch\u00e1y th\u00ec \u0111\u1ed9 m\u00e3nh li\u1ec7t c\u0169ng kh\u00f4ng k\u00e9m h\u01a1n magie bao nhi\u00eau. N\u1ebfu \u0111em nh\u00f4m nghi\u1ec1n th\u00e0nh b\u1ed9t m\u1ecbn, th\u00ec khi \u0111\u1ed1t ch\u00e1y c\u00f3 th\u1ec3 nung ch\u1ea3y gang th\u00e9p th\u00e0nh tr\u1ea1ng th\u00e1i l\u1ecfng.<\/p>\n\n\n\n
\u0110\u1ea7u ti\u00ean ng\u01b0\u1eddi ta cho magie ch\u00e1y tr\u1ef1c ti\u1ebfp trong kh\u00f4ng kh\u00ed \u0111\u1ec3 l\u00e0m \u0111\u00e8n ch\u1edbp. Nh\u01b0ng \u0111\u1ed1t theo ki\u1ec3u n\u00e0y, \u0111\u1ed1t ch\u00e1y r\u1ea5t ch\u1eadm. V\u1ec1 sau ng\u01b0\u1eddi ta c\u1ea3i ti\u1ebfn d\u00f9ng magie b\u1ed9t, c\u00f3 th\u00eam ch\u1ea5t tr\u1ee3 ch\u00e1y l\u00e0 kali clorat \u0111\u1ec3 c\u1ea5p th\u00eam oxy cho s\u1ef1 ch\u00e1y. Kali clorat khi b\u1ecb \u0111\u1ed1t n\u00f3ng s\u1ebd cho tho\u00e1t ra l\u01b0\u1ee3ng l\u1edbn oxy. \u0110\u00f3 ch\u00ednh l\u00e0 “th\u00eam d\u1ea7u v\u00e0o l\u1eeda” n\u00ean magie s\u1ebd ch\u00e1y m\u1ea1nh g\u1ea5p b\u1ed9i, l\u00e0m cho magie b\u1ecb ch\u00e1y s\u1ea1ch trong v\u00f2ng 1\/100 gi\u00e2y.<\/p>\n\n\n\n
Nh\u01b0ng d\u00f9ng b\u1ed9t magie kh\u00f4ng \u0111\u01b0\u1ee3c an to\u00e0n. D\u00f9ng nh\u00f4m thay th\u1ebf cho magie s\u1ebd t\u1ed1t h\u01a1n. H\u01a1n n\u1eefa nh\u00f4m l\u1ea1i r\u1ebb ti\u1ec1n h\u01a1n magie nhi\u1ec1u. Nh\u00f4m d\u1ec5 gia c\u00f4ng th\u00e0nh b\u1ed9t nh\u00f4m h\u01a1n magie. \u0110\u1ed9 d\u00e0y c\u1ee7a l\u00e1 nh\u00f4m c\u00f2n nh\u1ecf h\u01a1n k\u00edch th\u01b0\u1edbc s\u1ee3i t\u00f3c. Ng\u01b0\u1eddi ta l\u1ea1i d\u00f9ng oxy tinh khi\u1ebft thay cho kali clorat. Ng\u01b0\u1eddi ta cho nh\u00f4m l\u00e1 v\u00e0 oxy v\u00e0o \u1ed1ng thu\u1ef7 tinh nh\u1ecf v\u00e0 h\u00e0n k\u00edn th\u00e0nh b\u00f3ng \u0111\u00e8n ch\u1edbp s\u00e1ng. Vi\u1ec7c s\u1eed d\u1ee5ng lo\u1ea1i b\u00f3ng \u0111\u00e8n ch\u1edbp s\u00e1ng n\u00e0y r\u1ea5t d\u1ec5 d\u00e0ng ti\u1ec7n l\u1ee3i, ch\u00e1y r\u1ea5t nhanh, \u00e1nh s\u00e1ng ph\u00e1t ra m\u1ea1nh, l\u1ea1i r\u1ea5t t\u1eadp trung. Ch\u1edbp s\u00e1ng b\u00f9ng l\u00ean r\u1ed3i t\u1eaft ngay.<\/p>\n\n\n\n
Sau n\u00e0y ng\u01b0\u1eddi ta l\u1ea1i d\u00f9ng h\u1ee3p kim nh\u00f4m – magie k\u00e9o th\u00e0nh s\u1ee3i nh\u1ecf thay cho l\u00e1 nh\u00f4m \u0111\u1ec3 l\u00e0m b\u00f3ng \u0111\u00e8n ch\u1edbp. Trong b\u00f3ng \u0111\u00e8n ch\u1edbp ki\u1ec3u n\u00e0y, qu\u00e1 tr\u00ecnh oxy ho\u00e1 x\u1ea3y ra r\u1ea5t nhanh, th\u1ec3 t\u00edch b\u00f3ng \u0111\u00e8n l\u1ea1i r\u1ea5t nh\u1ecf, ch\u1ec9 b\u1eb1ng c\u1ee1 h\u1ea1t l\u1ea1c, d\u00f9ng r\u1ea5t ti\u1ec7n.<\/p>\n\n\n\n
Th\u1ebf nh\u01b0ng c\u00e1c lo\u1ea1i \u0111\u00e8n ch\u1edbp k\u1ec3 tr\u00ean ch\u1ec9 d\u00f9ng \u0111\u01b0\u1ee3c m\u1ed9t l\u1ea7n. Ng\u00e0y nay \u0111\u00e8n ch\u1edbp \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng c\u00e1c \u0111\u00e8n ch\u1edbp \u0111i\u1ec7n t\u1eed. \u0110\u00e8n ch\u1edbp \u0111i\u1ec7n t\u1eed d\u00f9ng ngu\u1ed3n pin kh\u00f4 l\u00e0m ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng c\u00f3 th\u1ec3 d\u00f9ng \u0111\u01b0\u1ee3c nhi\u1ec1u \u1ea7n. Ng\u01b0\u1eddi ta g\u1ecdi \u0111\u00f3 l\u00e0 “\u0111\u00e8n ch\u1edbp d\u00f9ng nhi\u1ec1u l\u1ea7n” (\u0110\u00e8n flash). \u0110\u00e8n ch\u1edbp \u0111i\u1ec7n t\u1eed d\u00f9ng n\u0103ng l\u01b0\u1ee3ng \u0111i\u1ec7n bi\u1ebfn th\u00e0nh n\u0103ng l\u01b0\u1ee3ng \u00e1nh s\u00e1ng v\u00e0 kh\u00f4ng c\u00f2n c\u1ea7n d\u00f9ng c\u00e1ch \u0111\u1ed1t ch\u00e1y kim lo\u1ea1i.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: \u0110\u00e8n ch\u1edbp s\u00e1ng.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
H\u01a1n n\u1eeda th\u1ebf k\u1ef7 tr\u01b0\u1edbc, c\u00e1c ph\u00f3ng vi\u00ean, k\u00fd gi\u1ea3 th\u01b0\u1eddng d\u00f9ng c\u00e1c lo\u1ea1i \u0111\u00e8n ch\u1edbp s\u00e1ng (\u0111\u00e8n flash), nghe m\u1ed9t ti\u1ebfng “t\u00e1ch” l\u00e0 ph\u00e1t ra tia ch\u1edbp s\u00e1ng lo\u00e9 m\u1eaft. B\u1ea5y gi\u1edd “c\u1eeda tr\u1eadp” c\u1ee7a m\u00e1y \u1ea3nh s\u1ebd m\u1edf ra v\u00e0 phim s\u1ebd b\u1eaft \u0111\u01b0\u1ee3c t\u1ed1t h\u00ecnh \u1ea3nh s\u1ef1 v\u1eadt c\u1ea7n ch\u1ee5p \u1ea3nh. V\u00e0o […]<\/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":[8,15],"tags":[],"class_list":["post-7992","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7992","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=7992"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7992\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}