Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
S\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn \u2013 Nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i c\u00f3 th\u1ec3 l\u00e0m th\u1ec3 t\u00edch c\u1ee7a m\u1ed9t v\u1eadt thay \u0111\u1ed5i hay kh\u00f4ng? \u0110\u00e2y s\u1ebd l\u00e0 c\u00e2u h\u1ecfi kh\u00f3 n\u1ebfu nh\u01b0 c\u00e1c em ch\u01b0a t\u1eebng \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn. Tr\u00ean th\u1ef1c t\u1ebf, khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i, ch\u1ea5t r\u1eafn v\u00e0 ch\u1ea5t l\u1ecfng c\u0169ng c\u00f3 s\u1ef1 thay \u0111\u1ed5i nh\u1ea5t \u0111\u1ecbnh. \u0110\u00e2y ch\u00ednh l\u00e0 nh\u1eefng ki\u1ebfn th\u1ee9c hay ho th\u00fa v\u1ecb m\u00e0 b\u1ed9 m\u00f4n v\u1eadt l\u00fd l\u1edbp 6 \u0111em \u0111\u1ebfn cho c\u00e1c em. C\u00f2n r\u1ea5t nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn xu\u1ea5t hi\u1ec7n quanh ch\u00fang ta. B\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay, ch\u00fang ta h\u00e3y c\u00f9ng nhau t\u00ecm hi\u1ec3u v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y nh\u00e9!<\/p>\n\n\n\n
L\u00fd thuy\u1ebft s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn<\/p>\n\n\n\n
C\u00e1c nh\u00e0 v\u1eadt l\u00fd \u0111\u00e3 nghi\u00ean c\u1ee9u v\u00e0 ch\u00fang minh \u0111\u01b0\u1ee3c nh\u1eefng \u0111\u1ecbnh l\u00fd li\u00ean quan \u0111\u1ebfn s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn. Khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng l\u00ean, c\u00e1c ch\u1ea5t r\u1eafn \u0111\u1ec1u n\u1edf ra. V\u00e0 khi nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m xu\u1ed1ng, c\u00e1c ch\u1ea5t r\u1eafn co l\u1ea1i. N\u00f3i ng\u1eafn g\u1ecdn, ch\u1ea5t r\u1eafn n\u1edf ra khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng cao v\u00e0 co l\u1ea1i khi g\u1eb7p l\u1ea1nh. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fd thuy\u1ebft v\u1ec1 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn. Trong th\u1ef1c t\u1ebf, c\u00f3 r\u1ea5t nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p ch\u00fang ta \u0111\u00e3 \u0111\u01b0\u1ee3c g\u1eb7p, ch\u00ednh l\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a \u0111i\u1ec1u n\u00e0y. Tuy nhi\u00ean, c\u00f3 th\u1ec3 ch\u00fang ta kh\u00f4ng nh\u1eadn ra, ho\u1eb7c ch\u01b0a bi\u1ebft \u0111\u1ebfn.<\/p>\n\n\n\n
C\u00e1c ch\u1ea5t r\u1eafn kh\u00e1c nhau c\u00f3 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t kh\u00e1c nhau<\/p>\n\n\n\n
V\u1eadt r\u1eafn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea5u t\u1ea1o t\u1eeb c\u00e1c ch\u1ea5t li\u1ec7u kh\u00e1c nhau. C\u00e1c ch\u1ea5t r\u1eafn mang theo ch\u1ea5t li\u1ec7u kh\u00e1c nhau c\u00f3 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t kh\u00e1c nhau. V\u00ed d\u1ee5 nh\u01b0 m\u1ed9t v\u1eadt \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng \u0111\u1ed3ng s\u1ebd c\u00f3 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t kh\u00e1c v\u1eadt l\u00e0m b\u1eb1ng nh\u00f4m. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 v\u1eadt l\u00fd h\u1ecdc ch\u1ee9ng minh. V\u00e0 \u0111\u00e3 c\u00f3 ri\u00eang nh\u1eefng con s\u1ed1 \u0111\u1ec3 n\u00f3i l\u00ean s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a c\u00e1c ch\u1ea5t. S\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn th\u1eadt s\u1ef1 r\u1ea5t quan tr\u1ecdng. N\u00f3 \u1ea3nh h\u01b0\u1edfng nhi\u1ec1u trong cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y c\u1ee7a ch\u00fang ta.<\/p>\n\n\n\n
Th\u00ed nghi\u1ec7m s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn<\/p>\n\n\n\n
\u0110\u1ed1i v\u1edbi ch\u1ea5t r\u1eafn, ng\u01b0\u1eddi ta ph\u00e2n bi\u1ec7t s\u1ef1 n\u1edf d\u00e0i v\u00e0 s\u1ef1 n\u1edf kh\u1ed1i. N\u1ebfu ch\u00fang ta ch\u1ec9 x\u00e9t v\u1eadt theo m\u1ed9t ph\u01b0\u01a1ng nh\u1ea5t \u0111\u1ecbnh. Ch\u00fang ta th\u1ea5y c\u00f3 s\u1ef1 thay \u0111\u1ed5i v\u1ec1 chi\u1ec1u d\u00e0i c\u1ee7a v\u1eadt th\u00ec \u0111\u00e2y ch\u00ednh l\u00e0 s\u1ef1 n\u1edf d\u00e0i. Tuy nhi\u00ean, v\u1eadt c\u00f2n c\u00f3 c\u1ea3 s\u1ef1 n\u1edf kh\u1ed1i nh\u01b0ng ch\u00fang ta kh\u00f4ng kh\u1ea3o s\u00e1t \u0111i\u1ec1u n\u00e0y. Trong c\u00e1c b\u1ea3ng s\u1ed1 li\u1ec7u v\u1eadt l\u00fd, ng\u01b0\u1eddi ta c\u0169ng th\u01b0\u1eddng ghi h\u1ec7 s\u1ed1 n\u1edf d\u00e0i c\u1ee7a ch\u1ea5t. Thay v\u00ec ghi h\u1ec7 s\u1ed1 n\u1edf kh\u1ed1i c\u1ee7a ch\u1ea5t. S\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c x\u00e9t tr\u00ean nhi\u1ec1u ph\u01b0\u01a1ng di\u1ec7n kh\u00e1c nhau.<\/p>\n\n\n\n
S\u1ef1 n\u1edf d\u00e0i c\u1ee7a ch\u1ea5t r\u1eafn<\/p>\n\n\n\n
\u0110\u1ec3 hi\u1ec3u h\u01a1n v\u1ec1 s\u1ef1 n\u1edf d\u00e0i c\u1ee7a ch\u1ea5t r\u1eafn, ch\u00fang ta ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t th\u00ed nghi\u1ec7m \u0111\u01a1n gi\u1ea3n sau \u0111\u00e2y. Chu\u1ea9n b\u1ecb m\u1ed9t thanh kim lo\u1ea1i \u0111\u1ed3ng ch\u1ea5t, m\u1ed9t \u0111\u1ea7u \u0111\u01b0\u1ee3c g\u1eafn ch\u1eb7t c\u1ed1 \u0111\u1ecbnh. M\u1ed9t b\u00ean kh\u00e1c chu\u1ea9n b\u1ecb m\u1ed9t l\u1eaby \u0111\u1ec3 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng g\u00f3c \u0111o khi thanh gi\u00e3n n\u1edf v\u00ec nhi\u1ec7t. Th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m b\u1eb1ng c\u00e1ch l\u1eafp \u0111\u1eb7t gi\u00e1 th\u00ed nghi\u1ec7m, b\u1ed1 tr\u00ed th\u00ed nghi\u1ec7m. Sau \u0111\u00f3 nung n\u00f3ng thanh kim lo\u1ea1i. Quan s\u00e1t s\u1ef1 m\u1edf r\u1ed9ng g\u00f3c \u0111o sau kho\u1ea3ng th\u1eddi gian b\u1ecb nung n\u00f3ng. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y s\u1ef1 n\u1edf d\u00e0i v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn. V\u1eadt r\u1eafn \u0111\u00e3 b\u1ecb bi\u1ebfn d\u1ea1ng khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i.<\/p>\n\n\n\n
\u1ee8ng d\u1ee5ng c\u1ee7a s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a c\u00e1c ch\u1ea5t l\u00e0 kh\u00e1c nhau<\/p>\n\n\n\n
S\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn theo chi\u1ec1u d\u00e0i \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 s\u1ef1 n\u1edf d\u00e0i. \u1ede \u0111\u00e2y, ch\u00fang ta xem x\u00e9t v\u1ec1 chi\u1ec1u d\u00e0i c\u1ee7a v\u1eadt tr\u01b0\u1edbc v\u00e0 sau khi nung n\u00f3ng. Chi\u1ec1u d\u00e0i l\u00fac sau khi nung n\u00f3ng s\u1ebd t\u0103ng th\u00eam m\u1ed9t \u0111o\u1ea1n. \u0110\u00e2y ch\u00ednh l\u00e0 s\u1ef1 n\u1edf d\u00e0i c\u1ee7a thanh c\u1ee9ng \u0111\u00f3 khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng l\u00ean. Ch\u00fang ta c\u00f3 th\u1ec3 quy \u01b0\u1edbc s\u1ef1 n\u1edf d\u00e0i c\u1ee7a ch\u1ea5t r\u1eafn theo bi\u1ec3u th\u1ee9c c\u00f3 trong s\u00e1ch gi\u00e1o khoa c\u1ee7a c\u00e1c em. Trong \u0111\u00f3 denta l ch\u00ednh l\u00e0 \u0111\u1ed9 d\u00e0i t\u0103ng l\u00ean c\u1ee7a thanh r\u1eafn.<\/p>\n\n\n\n
S\u1ef1 bi\u1ebfn \u0111\u1ed5i h\u00ecnh d\u1ea1ng c\u1ee7a ch\u1ea5t r\u1eafn<\/p>\n\n\n\n
Ngo\u00e0i ra, sau khi nhi\u1ec7t \u0111\u1ed9 c\u1ee7a thanh c\u1ee9ng tr\u1edf v\u1ec1 nh\u01b0 ban \u0111\u1ea7u, k\u00edch th\u01b0\u1edbc n\u00e0y c\u0169ng c\u00f3 th\u1ec3 co l\u1ea1i. Nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m \u0111i c\u0169ng l\u00e0m cho k\u00edch th\u01b0\u1edbc, chi\u1ec1u d\u00e0i c\u1ee7a v\u1eadt c\u1ee9ng gi\u1ea3m b\u1edbt. \u0110\u00e2y ch\u00ednh l\u00e0 nguy\u00ean l\u00fd c\u1ee7a s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn. Ngo\u00e0i ra, v\u1eadt r\u1eafn c\u00f2n c\u00f3 th\u1ec3 x\u00e9t tr\u00ean s\u1ef1 n\u1edf kh\u1ed1i v\u00ec nhi\u1ec7t.<\/p>\n\n\n\n
S\u1ef1 n\u1edf kh\u1ed1i c\u1ee7a ch\u1ea5t r\u1eafn<\/p>\n\n\n\n
\u0110\u1ed1i v\u1edbi nh\u1eefng v\u1eadt c\u00f3 h\u00ecnh d\u00e1ng thu\u00f4n d\u00e0i th\u00ec ch\u00fang ta c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng \u0111o \u0111\u01b0\u1ee3c s\u1ef1 n\u1edf d\u00e0i. Th\u1ebf nh\u01b0ng, v\u1edbi nh\u1eefng v\u1eadt r\u1eafn h\u00ecnh c\u1ea7u th\u00ec sao. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ch\u00fang ta c\u00f3 th\u1ec3 \u0111o \u0111\u01b0\u1ee3c s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn n\u00e0y. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fd do ch\u00fang ta x\u00e9t \u0111\u1ebfn s\u1ef1 n\u1edf kh\u1ed1i c\u1ee7a ch\u1ea5t r\u1eafn. Nh\u1eefng v\u1eadt c\u00f3 h\u00ecnh d\u00e1ng nh\u01b0 h\u00ecnh c\u1ea7u, h\u00ecnh h\u1ed9p th\u00ec ch\u00fang ta s\u1ebd x\u00e9t \u0111\u1ebfn s\u1ef1 n\u1edf kh\u1ed1i. Khi nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt r\u1eafn \u0111\u00f3 t\u0103ng l\u00ean, th\u00ec th\u1ec3 t\u00edch c\u1ee7a v\u1eadt r\u1eafn \u0111\u00f3 c\u0169ng t\u0103ng l\u00ean. Ch\u00fang ta c\u00f3 th\u1ec3 l\u00e0m th\u00ed nghi\u1ec7m v\u1edbi vi\u00ean bi c\u1ee9ng b\u1eb1ng \u0111\u1ed3ng.<\/p>\n\n\n\n
Chu\u1ea9n b\u1ecb th\u00ed nghi\u1ec7m s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t<\/p>\n\n\n\n
Chu\u1ea9n b\u1ecb m\u1ed9t vi\u00ean bi b\u1eb1ng \u0111\u1ed3ng, m\u1ed9t v\u00f2ng kim lo\u1ea1i \u0111\u1ec3 vi\u00ean bi chui qua d\u1ec5 d\u00e0ng. Nung n\u00f3ng vi\u00ean bi \u0111\u1ed3ng, th\u1eed l\u1ea1i xem vi\u00ean bi c\u00f3 th\u1ec3 l\u1ecdt qua v\u00f2ng kim lo\u1ea1i hay kh\u00f4ng. N\u1ebfu vi\u00ean bi kh\u00f4ng l\u1ecdt qua, th\u00ec \u0111\u00e2y ch\u00ednh l\u00e0 s\u1ef1 n\u1edf kh\u1ed1i v\u00ec nhi\u1ec7t c\u1ee7a vi\u00ean bi. Ch\u00fa \u00fd n\u00ean ch\u1ecdn v\u00f2ng kim lo\u1ea1i c\u00f3 k\u00edch th\u01b0\u1edbc s\u00e1t v\u1edbi k\u00edch th\u01b0\u1edbc c\u1ee7a vi\u00ean bi \u0111\u1ec3 l\u00e0m th\u00ed nghi\u1ec7m n\u00e0y chu\u1ea9n h\u01a1n. S\u1ef1 n\u1edf v\u00ec nhi\u1ec7t kh\u00f4ng ch\u1ec9 l\u00e0 s\u1ef1 n\u1edf d\u00e0i m\u00e0 c\u00f2n l\u00e0 s\u1ef1 n\u1edf kh\u1ed1i. Khi nhi\u1ec7t \u0111\u1ed9 xung quanh t\u0103ng l\u00ean, d\u1ec5 \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt r\u1eafn c\u0169ng t\u0103ng l\u00ean. T\u1eeb \u0111\u00f3 d\u1eabn \u0111\u1ebfn s\u1ef1 thay \u0111\u1ed5i trong k\u00edch th\u01b0\u1edbc v\u00e0 th\u1ec3 t\u00edch c\u1ee7a v\u1eadt.<\/p>\n\n\n\n
T\u00ecm hi\u1ec3u th\u00eam<\/p><\/blockquote>\n\n\n\n
T\u00ecm hi\u1ec3u v\u1ec1 r\u00f2ng r\u1ecdc c\u1ed1 \u0111\u1ecbnh? Gi\u1ea3i \u0111\u00e1p ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd 6<\/p>\n\n\n\n
Chuy\u1ec3n \u0111\u1ed9ng c\u01a1 h\u1ecdc l\u00e0 g\u00ec? C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp c\u1ea7n l\u01b0u \u00fd<\/p>\n\n\n\n
Ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i b\u00e0i t\u1eadp<\/p>\n\n\n\n
Ch\u1eafc h\u1eb3n c\u00e1c em sau khi h\u1ecdc xong ch\u1ee7 \u0111\u1ec1 n\u00e0y s\u1ebd c\u00f3 r\u1ea5t nhi\u1ec1u nh\u1eefng b\u00e0i t\u1eadp li\u00ean quan. T\u1eeb nh\u1eefng d\u1ea1ng b\u00e0i tr\u1eafc nghi\u1ec7m l\u00fd thuy\u1ebft cho \u0111\u1ebfn t\u00ednh to\u00e1n, v\u1eadn d\u1ee5ng th\u1ef1c t\u1ebf. C\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c th\u1ea7y c\u00f4 tr\u00ean l\u1edbp cho th\u1ef1c hi\u1ec7n v\u00e0 v\u1eadn d\u1ee5ng. Tuy nhi\u00ean, c\u00e1c em \u0111\u00e3 ghi nh\u1edb \u0111\u01b0\u1ee3c ph\u01b0\u01a1ng ph\u00e1p gi\u1ea3i cho t\u1ea5t c\u1ea3 c\u00e1c d\u1ea1ng b\u00e0i n\u00e0y hay ch\u01b0a. \u0110i\u1ec1u \u0111\u1ea7u ti\u00ean ch\u00ednh l\u00e0 c\u00e1c em c\u1ea7n ph\u1ea3i n\u1eafm r\u00f5 l\u00fd thuy\u1ebft.<\/p>\n\n\n\n
\u1ee8ng d\u1ee5ng s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn<\/p>\n\n\n\n
L\u00fd thuy\u1ebft c\u1ea7n nh\u1edb<\/p>\n\n\n\n
C\u00e1c ch\u1ea5t r\u1eafn \u0111\u1ec1u n\u1edf ra v\u00ec nhi\u1ec7t. Khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng cao, ch\u1ea5t r\u1eafn s\u1ebd n\u1edf ra. Khi nhi\u1ec7t \u0111\u1ed9 gi\u1ea3m \u0111i, ch\u1ea5t r\u1eafn s\u1ebd co l\u1ea1i. Nhi\u1ec7t \u0111\u1ed9 t\u1eeb m\u00f4i tr\u01b0\u1eddng b\u00ean ngo\u00e0i c\u0169ng c\u00f3 th\u1ec3 t\u00e1c \u0111\u1ed9ng l\u00ean k\u00edch th\u01b0\u1edbc c\u1ee7a v\u1eadt r\u1eafn.<\/p>\n\n\n\n
C\u00e1c ch\u1ea5t kh\u00e1c nhau c\u00f3 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t kh\u00e1c nhau. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 v\u1eadt l\u00fd h\u1ecdc ch\u1ee9ng minh. V\u00ed d\u1ee5 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a \u0111\u1ed3ng, s\u1ebd kh\u00e1c s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a nh\u00f4m hay s\u1eaft. C\u00e1c em khi l\u00e0m b\u00e0i n\u00ean n\u00ean ch\u00fa \u00fd \u0111\u1ebfn c\u00e1c h\u1ec7 s\u1ed1 n\u00e0y \u0111\u1ec3 t\u00ednh to\u00e1n ch\u00ednh x\u00e1c. H\u1ea7u h\u1ebft c\u00e1c b\u00e0i c\u00f3 li\u00ean quan \u0111\u1ebfn t\u00ednh to\u00e1n \u0111\u1ec1u s\u1ebd cho s\u1ed1 li\u1ec7u theo c\u00e1c ch\u1ea5t.<\/p>\n\n\n\n
C\u00f9ng m\u1ed9t ch\u1ea5t, n\u01a1i n\u00e0o c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n t\u00e1c \u0111\u1ed9ng th\u00ec s\u1ebd n\u1edf v\u00ec nhi\u1ec7t nhi\u1ec1u h\u01a1n. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng m\u00ecnh trong nhi\u1ec1u th\u00ed nghi\u1ec7m. Kh\u00f4ng ph\u1ea3i b\u1ea5t c\u1ee9 nhi\u1ec7t \u0111\u1ed9 n\u00e0o v\u1eadt c\u0169ng thay \u0111\u1ed5i nh\u01b0 nhau. Nhi\u1ec7t \u0111\u1ed9 c\u00e0ng cao, s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t di\u1ec5n ra \u1edf v\u1eadt c\u00e0ng m\u1ea1nh m\u1ebd. N\u00ean nhi\u1ec1u khi ch\u00fang ta th\u1ef1c hi\u1ec7n h\u01a1 l\u1eeda m\u1ed9t ph\u1ea7n c\u1ee7a v\u1eadt th\u00ec ph\u1ea7n \u0111\u00f3 s\u1ebd n\u1edf ra nhi\u1ec1u h\u01a1n ph\u1ea7n c\u00f2n l\u1ea1i. C\u00e1c em ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng \u0111i\u1ec1u n\u00e0y trong c\u00e1c b\u00e0i t\u1eadp th\u1ef1c t\u1ebf, gi\u1ea3i th\u00edch v\u1ec1 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a v\u1eadt.<\/p>\n\n\n\n
C\u00e1ch h\u1ecdc v\u1eadt l\u00fd 6 t\u1ed1t<\/p>\n\n\n\n
\u0110\u00e2y ch\u00ednh l\u00e0 nh\u1eefng l\u01b0u \u00fd v\u1ec1 c\u00e1ch l\u00e0m trong c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn. Ch\u1ec9 c\u1ea7n c\u00e1c em nh\u1edb r\u00f5 l\u00fd thuy\u1ebft v\u00e0 nh\u1eefng \u0111i\u1ec1u n\u00e0y, c\u00e1c em s\u1ebd l\u00e0m b\u00e0i t\u1eadp t\u1ed1t h\u01a1n. Ngo\u00e0i ra, trong c\u00e1c b\u00e0i tr\u1eafc nghi\u1ec7m, c\u00e1c em c\u1ea7n \u0111\u1ecdc k\u1ef9 l\u00fd thuy\u1ebft \u0111\u1ec3 ch\u1ecdn \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c nh\u1ea5t. \u0110\u00f4i khi \u0111\u00e1p \u00e1n c\u00f3 th\u1ec3 \u0111\u00fang nh\u01b0ng thi\u1ebfu, \u0111\u00e1p \u00e1n \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t m\u1edbi l\u00e0 \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c nh\u1ea5t.<\/p>\n\n\n\n
Tr\u00ean \u0111\u00e2y ch\u00ednh l\u00e0 nh\u1eefng th\u00f4ng tin v\u1ec1 s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn d\u00e0nh cho c\u00e1c em mong mu\u1ed1n t\u00ecm hi\u1ec3u. \u0110\u00e2y l\u00e0 m\u1ed9t b\u00e0i h\u1ecdc trong ch\u01b0\u01a1ng tr\u00ecnh v\u1eadt l\u00fd 6. Hy v\u1ecdng nh\u1eefng th\u00f4ng tin n\u00e0y c\u00f3 th\u1ec3 gi\u00fap \u00edch cho c\u00e1c em trong vi\u1ec7c h\u1ecdc b\u00e0i, thi c\u1eed, v\u00e0 v\u1eadn d\u1ee5ng th\u1ef1c t\u1ebf. C\u00f3 r\u1ea5t nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p trong cu\u1ed9c s\u1ed1ng c\u1ee7a ch\u00fang ta c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng \u0111\u01b0\u1ee3c \u0111i\u1ec1u n\u00e0y. C\u00e1c em h\u00e3y h\u1ecdc h\u1ecfi v\u00e0 \u00e1p d\u1ee5ng ngay nh\u00e9!<\/p>\n\n\n\n
Ngo\u00e0i ra, tr\u00ean trang ch\u1ee7 c\u1ee7a ch\u00fang t\u00f4i c\u0169ng c\u00f3 nh\u1eefng b\u00e0i vi\u1ebft m\u1edbi. C\u00e1c em c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 V\u1eadt L\u00fd, H\u00f3a h\u1ecdc t\u1ea1i \u0111\u00e2y.<\/p>\n\n\n\n
T\u00ecm \u0111\u1ecdc th\u00eam c\u00e1c b\u00e0i vi\u1ebft c\u00f9ng ch\u1ee7 \u0111\u1ec1<\/p><\/blockquote>\n\n\n\n
S\u1ef1 n\u00f3ng ch\u1ea3y v\u00e0 s\u1ef1 \u0111\u00f4ng \u0111\u1eb7c l\u00e0 g\u00ec? Ki\u1ebfn th\u1ee9c l\u00fd 6<\/p>\n\n\n\n
Nhi\u1ec7t k\u1ebf l\u00e0 g\u00ec? 3 lo\u1ea1i nhi\u1ec7t k\u1ebf n\u00e0o ph\u1ed5 bi\u1ebfn nh\u1ea5t b\u1ea1n c\u00f3 bi\u1ebft?<\/p>\n\n\n\n
C\u00e1ch \u0111o th\u1ec3 t\u00edch v\u1eadt r\u1eafn kh\u00f4ng th\u1ea5m n\u01b0\u1edb<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn S\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn \u2013 Nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i c\u00f3 th\u1ec3 l\u00e0m th\u1ec3 t\u00edch c\u1ee7a m\u1ed9t v\u1eadt thay \u0111\u1ed5i hay kh\u00f4ng? \u0110\u00e2y s\u1ebd l\u00e0 c\u00e2u h\u1ecfi kh\u00f3 n\u1ebfu nh\u01b0 c\u00e1c em ch\u01b0a t\u1eebng \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn s\u1ef1 n\u1edf v\u00ec nhi\u1ec7t c\u1ee7a ch\u1ea5t r\u1eafn. Tr\u00ean th\u1ef1c t\u1ebf, […]<\/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":[4,7],"tags":[],"class_list":["post-1157","post","type-post","status-publish","format-standard","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1157","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=1157"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1157\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1157"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}