{"id":1147,"date":"2021-10-09T00:45:43","date_gmt":"2021-10-09T00:45:43","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=1147"},"modified":"2021-10-14T22:12:08","modified_gmt":"2021-10-14T15:12:08","slug":"khoi-luong-rieng-va-trong-luong-rieng-la-gi-vat-ly-6","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/khoi-luong-rieng-va-trong-luong-rieng-la-gi-vat-ly-6\/","title":{"rendered":"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec? V\u1eadt l\u00fd 6"},"content":{"rendered":"\n<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p>Gi\u1ed1ng nh\u01b0 kh\u1ed1i l\u01b0\u1ee3ng, v\u1ea1n v\u1eadt tr\u00ean tr\u00e1i \u0111\u1ea5t n\u00e0y \u0111\u1ec1u c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang. Ch\u00fang ta kh\u00f4ng th\u1ec3 t\u1ef1 nhi\u00ean x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y m\u00e0 c\u1ea7n ph\u1ea3i d\u1ef1a v\u00e0o quy tr\u00ecnh, t\u00ednh to\u00e1n. Trong b\u1ed9 m\u00f4n V\u1eadt l\u00fd, ch\u00fang ta s\u1ebd c\u00f3 nh\u1eefng c\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ednh to\u00e1n ra nh\u1eefng s\u1ed1 li\u1ec7u n\u00e0y. C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 nghi\u00ean c\u1ee9u v\u00e0 \u0111em \u0111\u1ebfn cho ch\u00fang ta nh\u1eb1m gi\u1ea3i \u0111\u00e1p nh\u1eefng c\u00e2u h\u1ecfi. V\u1eady kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec? N\u00f3 \u0111em l\u1ea1i \u00fd ngh\u0129a g\u00ec cho cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y? Ch\u00fang ta h\u00e3y c\u00f9ng nhau t\u00ecm hi\u1ec3u v\u00e0 l\u1ea5y v\u00ed d\u1ee5 \u0111\u1ec3 hi\u1ec3u h\u01a1n v\u1ec1 ch\u1ee7 \u0111\u1ec1, b\u00e0i h\u1ecdc n\u00e0y nh\u00e9!<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec?<\/p>\n\n\n\n<p>Ch\u00fang ta \u0111\u00e3 \u0111\u01b0\u1ee3c nghe r\u1ea5t nhi\u1ec1u v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t v\u1eadt. Kh\u1ed1i l\u01b0\u1ee3ng ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 \u0111\u1ed9 n\u1eb7ng c\u1ee7a m\u1ed9t v\u1eadt ho\u1eb7c m\u1ed9t ch\u1ea5t n\u00e0o \u0111\u00f3. Tuy nhi\u00ean, v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang th\u00ec l\u1ea1i kh\u00f4ng ch\u1ec9 \u0111\u01a1n gi\u1ea3n nh\u01b0 v\u1eady. N\u1ebfu nh\u01b0 kh\u1ed1i l\u01b0\u1ee3ng x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 n\u1eb7ng c\u1ee7a m\u1ed9t v\u1eadt, kh\u00f4ng t\u00ednh theo c\u00e1c ch\u1ea5t c\u1ea5u th\u00e0nh l\u00ean v\u1eadt. Th\u00ec \u0111\u1ebfn v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, ng\u01b0\u1eddi ta quan t\u00e2m nhi\u1ec1u h\u01a1n \u0111\u1ebfn ch\u1ea5t.<\/p>\n\n\n\n<p>C\u00e1c ch\u1ea5t kh\u00e1c nhau c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang kh\u00e1c nhau<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch (1m kh\u1ed1i) c\u1ee7a ch\u1ea5t \u0111\u00f3. \u0110\u01a1n v\u1ecb c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang kg\/1m kh\u1ed1i. Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng th\u01b0\u01a1ng s\u1ed1 gi\u1eefa kh\u1ed1i l\u01b0\u1ee3ng (m) c\u1ee7a 1 v\u1eadt b\u1eb1ng ch\u1ea5t \u1ea5y nguy\u00ean ch\u1ea5t v\u00e0 th\u1ec3 t\u00edch c\u1ee7a v\u1eadt \u1ea5y (V). Ch\u00fang ta ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t nh\u1edd v\u00e0o m\u1ed9t v\u1eadt \u0111\u01b0\u1ee3c l\u00e0m ho\u00e0n to\u00e0n b\u1eb1ng ch\u1ea5t \u1ea5y. Ch\u1ec9 c\u1ea7u c\u00f3 \u0111\u1ee7 3 \u0111i\u1ec1u ki\u1ec7n, v\u1eadt \u0111\u01b0\u1ee3c l\u00e0m ho\u00e0n to\u00e0n b\u1eb1ng ch\u1ea5t \u1ea5y, th\u1ec3 t\u00edch c\u1ee7a v\u1eadt, kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.<\/p>\n\n\n\n<p>C\u00f4ng th\u1ee9c t\u1ed5ng qu\u00e1t \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t nh\u01b0 sau:<\/p>\n\n\n\n<p>D = m\/V<\/p>\n\n\n\n<p>Trong \u0111\u00f3 D l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a ch\u1ea5t. K\u00ed hi\u1ec7u m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng ch\u1ea5t \u0111\u00f3. K\u00ed hi\u1ec7u V l\u00e0 th\u1ec3 t\u00edch c\u1ee7a v\u1eadt. Trong c\u00e1c b\u00e0i to\u00e1n y\u00eau c\u1ea7u x\u00e1c \u0111\u1ecbnh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a v\u1eadt, c\u00e1c em c\u1ea7n ph\u1ea3i ghi nh\u1edb c\u00f4ng th\u1ee9c n\u00e0y. \u0110\u00e2y s\u1ebd l\u00e0 c\u00f4ng c\u1ee5 gi\u00fap c\u00e1c em d\u1ec5 d\u00e0ng t\u00ednh to\u00e0n, x\u00e1c \u0111\u1ecbnh c\u00e1c y\u1ebfu t\u1ed1 l\u00e0m b\u00e0i t\u1eadp tr\u00ean l\u1edbp.<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec?<\/p>\n\n\n\n<p>B\u00ean c\u1ea1nh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u0169ng l\u00e0 m\u1ed9t trong nh\u1eefng y\u1ebfu t\u1ed1 c\u1ea7n \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh. Ch\u00fang ta \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00ecm hi\u1ec3u r\u1ea5t k\u1ef9 v\u1ec1 tr\u1ecdng l\u01b0\u1ee3ng, tr\u1ecdng l\u1ef1c. Tr\u1ecdng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ed9 l\u1edbn c\u1ee7a tr\u1ecdng l\u1ef1c t\u00e1c \u0111\u1ed9ng l\u00ean v\u1eadt. V\u1eady tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t l\u00e0 g\u00ec? Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a ch\u1ea5t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a 1 m kh\u1ed1i ch\u1ea5t \u0111\u00f3. \u0110\u00e2y s\u1ebd l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng li\u00ean quan \u0111\u1ebfn ch\u1ea5t c\u1ea5u th\u00e0nh v\u1eadt ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 c\u1ee7a v\u1eadt nh\u01b0 tr\u01b0\u1edbc \u0111\u00e2y. Ch\u00ednh v\u00ec v\u1eady m\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang.<\/p>\n\n\n\n<p>C\u00e1c \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang<\/p>\n\n\n\n<p>N\u1ebfu m\u1ed9t v\u1eadt \u0111\u01b0\u1ee3c ho\u00e0n to\u00e0n l\u00e0m b\u1eb1ng ch\u1ea5t \u0111\u00f3, ch\u00fang ta c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a ch\u1ea5t nh\u1edd v\u00e0o v\u1eadt n\u00e0y. Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a ch\u1ea5t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng th\u01b0\u01a1ng s\u1ed1 c\u1ee7a tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a v\u1eadt v\u00e0 th\u1ec3 t\u00edch. Tuy nhi\u00ean, c\u00f4ng th\u1ee9c n\u00e0y ch\u1ec9 \u0111\u00fang khi v\u1eadt \u0111\u01b0\u1ee3c l\u00e0m ho\u00e0n to\u00e0n b\u1eb1ng ch\u1ea5t n\u00e0y. Ta c\u00f3 c\u00f4ng th\u1ee9c nh\u01b0 sau:<\/p>\n\n\n\n<p>d = P\/V<\/p>\n\n\n\n<p>Gi\u1ea3i th\u00edch c\u00f4ng th\u1ee9c<\/p>\n\n\n\n<p>Trong \u0111\u00f3 d ch\u00ednh l\u00e0 k\u00ed hi\u1ec7u tr\u1ecdng ri\u00eang ri\u00eang c\u1ee7a ch\u1ea5t. P l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt \u0111\u01b0\u1ee3c c\u1ea5u th\u00e0nh t\u1eeb ch\u1ea5t \u0111\u00f3. V l\u00e0 th\u1ec3 t\u00edch c\u1ee7a v\u1eadt \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb ch\u1ea5t n\u00e0y. C\u00e1c em n\u00ean ghi nh\u1edb \u0111\u01a1n v\u1ecb \u0111o c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang \u0111\u1ec3 tr\u00e1nh b\u1ecb nh\u1ea7m l\u1eabn. Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u00f3 \u0111\u01a1n v\u1ecb \u0111o l\u00e0 N\/m kh\u1ed1i. C\u00e1c em s\u1ebd c\u00f3 nh\u1eefng b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn hai \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y. V\u00ec v\u1eady, hi\u1ec3u c\u00f4ng th\u1ee9c v\u00e0 h\u1ecdc thu\u1ed9c \u0111\u01b0\u1ee3c nh\u1eefng c\u00f4ng th\u1ee9c n\u00e0y. C\u00e1c em s\u1ebd v\u1eadn d\u1ee5ng v\u00e0o b\u00e0i t\u1eadp t\u1ed1t h\u01a1n. Kh\u00f4ng ph\u1ea3i t\u1ef1 nhi\u00ean, nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o ch\u01b0\u01a1ng tr\u00ecnh gi\u1ea3ng d\u1ea1y c\u1ee7a c\u00e1c em trong m\u00f4n v\u1eadt l\u00fd 6.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>T\u00ecm hi\u1ec3u th\u00eam<\/p><\/blockquote>\n\n\n\n<p>L\u1ef1c k\u1ebf ph\u00e9p \u0111o l\u1ef1c tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng \u2013 V\u1eadt l\u00fd 6<\/p>\n\n\n\n<p>C\u00e1c m\u00e1y c\u01a1 \u0111\u01a1n gi\u1ea3n l\u00e0 g\u00ec? Gi\u1ea3i \u0111\u00e1p nh\u1eefng \u0111i\u1ec1u c\u1ea7n bi\u1ebft v\u1ec1 v\u1eadt l\u00fd 6<\/p>\n\n\n\n<p>M\u1ed1i quan h\u1ec7 gi\u1eefa kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang<\/p>\n\n\n\n<p>\u0110\u00e2y l\u00e0 hai \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f3 s\u1ef1 li\u00ean k\u1ebft v\u1edbi nhau. Khi x\u00e9t tr\u00ean c\u00f9ng m\u1ed9t ch\u1ea5t, c\u00e1c em c\u00f3 th\u1ec3 suy t\u1eeb kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang ra tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u1ee9ng minh trong c\u00e1c th\u00ed nghi\u1ec7m khoa h\u1ecdc. D\u1ef1a v\u00e0o c\u00f4ng th\u1ee9c g\u1ed1c P = 10.m. Ta c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng \u0111\u1ec3 suy ra m\u1ed1i quan h\u1ec7 gi\u1eefa hai \u0111\u1ea1i l\u01b0\u1ee3ng D v\u00e0 d.<\/p>\n\n\n\n<p>C\u00f4ng th\u1ee9c t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang<\/p>\n\n\n\n<p>T\u1eeb c\u00f4ng th\u1ee9c \u0111\u00e3 bi\u1ebfn \u0111\u1ed5i n\u00e0y, ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a ch\u1ea5t \u0111\u00f3 chia cho 10. C\u00f4ng th\u1ee9c n\u00e0y gi\u00fap c\u00e1c em t\u00ednh to\u00e1n nhanh ch\u00f3ng khi \u0111\u1ec1 b\u00e0i y\u00eau c\u1ea7u x\u00e1c \u0111\u1ecbnh \u0111\u1ea1i l\u01b0\u1ee3ng ch\u01b0a bi\u1ebft. Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t lu\u00f4n c\u00f3 s\u1ef1 li\u00ean h\u1ec7 v\u1edbi nhau. Nh\u01b0ng khi l\u00e0m b\u00e0i, c\u00e1c em c\u1ea7n ph\u1ea3i x\u00e1c \u0111\u1ecbnh r\u00f5 l\u00e0 c\u00f9ng m\u1ed9t ch\u1ea5t m\u1edbi c\u00f3 th\u1ec3 d\u00f9ng c\u00f4ng th\u1ee9c n\u00e0y. Ngo\u00e0i ra khi \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c, c\u00e1c em c\u1ea7n ch\u00fa \u00fd \u0111\u01a1n v\u1ecb c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang. Sai \u0111\u01a1n v\u1ecb, c\u00e1c em s\u1ebd b\u1ecb sai k\u1ebft qu\u1ea3 v\u00e0 d\u1ec5 b\u1ecb nh\u1ea7m l\u1eabn gi\u1eefa hai \u0111\u1ea1i l\u01b0\u1ee3ng.<\/p>\n\n\n\n<p>\u1ee8ng d\u1ee5ng kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang trong cu\u1ed9c s\u1ed1ng<\/p>\n\n\n\n<p>Trong cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y, hai \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y c\u0169ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ea5t nhi\u1ec1u \u0111\u1ec3 x\u1eed l\u00fd c\u00f4ng vi\u1ec7c. Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang gi\u00fap con ng\u01b0\u1eddi ta so s\u00e1nh m\u1ee9c \u0111\u1ed9 n\u1eb7ng nh\u1eb9 c\u1ee7a v\u1eadt ch\u1ea5t n\u00e0y so v\u1edbi v\u1eadt ch\u1ea5t kh\u00e1c. Ch\u00fang ta c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01a1n gi\u1ea3n. C\u00f9ng l\u00e0 m\u1ed9t m\u00f3n \u0111\u1ed3, nh\u01b0ng khi s\u1eed d\u1ee5ng ch\u1ea5t c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang nh\u1eb9 h\u01a1n \u0111\u1ec3 l\u00e0m s\u1ebd \u0111em \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng v\u1eadt nh\u1ecf h\u01a1n. Nh\u01b0 v\u1eady, ch\u00fang ta c\u00f3 th\u1ec3 d\u1ec5 ch\u1ecdn ch\u1ea5t li\u1ec7u \u0111\u1ec3 l\u00e0m v\u1eadt h\u01a1n. V\u00ed d\u1ee5 nh\u01b0 c\u00e1i n\u1ed3i b\u1eb1ng \u0111\u1ed3ng s\u1ebd n\u1eb7ng h\u01a1n c\u00e1i n\u1ed3i b\u1eb1ng nh\u00f4m. \u0110\u00e2y ch\u00ednh l\u00e0 \u00fd ngh\u0129a c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang.<\/p>\n\n\n\n<p>Ch\u00fa \u00fd khi l\u00e0m b\u00e0i t\u1eadp<\/p>\n\n\n\n<p>Kh\u00f4ng ch\u1ec9 v\u1eady, kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u00f2n l\u00e0 y\u1ebfu t\u1ed1 ti\u00ean quy\u1ebft \u0111\u1ec3 ch\u1ecdn v\u1eadt li\u1ec7u trong ng\u00e0nh c\u01a1 kh\u00ed. Trong v\u1eadn t\u1ea3i \u0111\u01b0\u1eddng th\u1ee7y, kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u0169ng \u0111\u01b0\u1ee3c ch\u1ecdn \u0111\u1ec3 t\u00ednh t\u1ef7 tr\u1ecdng d\u1ea7u nh\u1edbt, n\u01b0\u1edbc \u0111\u1ec3 ph\u00e2n b\u1ed5 v\u00e0o c\u00e1c k\u00e9t cho ph\u00f9 h\u1ee3p v\u00e0 c\u00e2n b\u1eb1ng. Nh\u01b0 v\u1eady, vi\u1ec7c bi\u1ebft \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a ch\u1ea5t gi\u00fap ch\u00fang ta r\u1ea5t nhi\u1ec1u trong cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y. \u0110\u1ed1i v\u1edbi c\u00e1c em, \u0111\u00e2y c\u0169ng l\u00e0 \u0111i\u1ec1u gi\u00fap c\u00e1c em l\u00e0m b\u00e0i, <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc t\u1eadp<\/a> t\u1ed1t h\u01a1n. H\u00e3y h\u1ecdc v\u00e0 ghi nh\u1edb nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y \u0111\u1ec3 c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c nhi\u1ec1u \u0111i\u1ec3m t\u1ed1t nh\u00e9!<\/p>\n\n\n\n<p>B\u1ea3ng kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang<\/p>\n\n\n\n<p>C\u00e1c b\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m li\u00ean quan \u0111\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang<\/p>\n\n\n\n<p>B\u00e0i 1: Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y \u0111\u00fang?<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a 1m^3 ch\u1ea5t \u0111\u00f3.<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng 1 m ch\u1ea5t \u0111\u00f3.<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u00e2n \u0111\u01b0\u1ee3c c\u1ee7a m\u1ed9t ch\u1ea5t h\u00ecnh kh\u1ed1i.<\/p>\n\n\n\n<p>\u0110\u00e1p \u00e1n:<\/p>\n\n\n\n<p>Ch\u1ecdn \u0111\u00e1p \u00e1n A: Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a 1m^2 ch\u1ea5t \u0111\u00f3<\/p>\n\n\n\n<p>B\u00e0i 2: \u0110\u01a1n v\u1ecb n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u01a1n v\u1ecb c\u1ee7a tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang:<\/p>\n\n\n\n<p>A.Kg\/m^3<\/p>\n\n\n\n<p>N\/m^3<\/p>\n\n\n\n<p>N\/m^2<\/p>\n\n\n\n<p>Kg\/m^2<\/p>\n\n\n\n<p>\u0110\u00e1p \u00e1n:<\/p>\n\n\n\n<p>Ch\u1ecdn \u0111\u00e1p \u00e1n A<\/p>\n\n\n\n<p>B\u00e0i 3: Bi\u1ebft th\u1ec3 t\u00edch \u0111\u00e1 l\u00e0 0,5m^2, kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a \u0111\u00e1 l\u00e0 2600kg\/m^3. V\u1eady kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a \u0111\u00e1 l\u00e0 bao nhi\u00eau?<\/p>\n\n\n\n<p>\u0110\u00e1p \u00e1n: \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c: m = D.V n\u00ean ta c\u00f3: m=0,5.2600=1300(kg)<\/p>\n\n\n\n<p>B\u00e0i 4: Mu\u1ed1n \u0111o kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a c\u00e1c vi\u00ean bi thu\u1ef7 tinh ta c\u1ea7n d\u00f9ng nh\u1eefng d\u1ee5ng c\u1ee5 g\u00ec? H\u00e3y ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang.<\/p>\n\n\n\n<p>Ch\u1ec9 c\u1ea7n d\u00f9ng m\u1ed9t c\u00e1i l\u1ef1c k\u1ebf<\/p>\n\n\n\n<p>Ch\u1ec9 c\u1ea7n m\u1ed9t c\u00e1i c\u00e2n<\/p>\n\n\n\n<p>Ch\u1ec9 d\u00f9ng m\u1ed9t c\u00e1i c\u00e2n v\u00e0 m\u1ed9t b\u00ecnh chia \u0111\u1ed9<\/p>\n\n\n\n<p>Ch\u1ec9 c\u1ea7n d\u00f9ng m\u1ed9t b\u00ecnh chia \u0111\u1ed9<\/p>\n\n\n\n<p>\u0110\u00e1p \u00e1n:<\/p>\n\n\n\n<p>Ch\u1ecdn \u0111\u00e1p \u00e1n C: c\u1ea7n d\u00f9ng m\u1ed9t c\u00e1i c\u00e2n v\u00e0 m\u1ed9t b\u00ecnh chia \u0111\u1ed9.<\/p>\n\n\n\n<p>B\u00e0i 5: Trong c\u00e1c c\u00e2u sau \u0111\u00e2y, c\u00e2u n\u00e0o kh\u00f4ng \u0111\u00fang?<\/p>\n\n\n\n<p>a, L\u1ef1c k\u1ebf l\u00e0 d\u1ee5ng c\u1ee5 \u0111\u1ec3 \u0111o kh\u1ed1i l\u01b0\u1ee3ng.<\/p>\n\n\n\n<p>b, C\u00e2n R\u00f4b\u00e9cvan l\u00e0 d\u1ee5ng c\u1ee5 \u0111o kh\u1ed1i l\u01b0\u1ee3ng.<\/p>\n\n\n\n<p>c, L\u1ef1c k\u1ebf d\u00f9ng \u0111\u1ec3 \u0111o l\u1ef1c. C\u00f2n c\u00e2n d\u00f9ng \u0111\u1ec3 \u0111o kh\u1ed1i l\u01b0\u1ee3ng.<\/p>\n\n\n\n<p>\u0110\u00e1p \u00e1n: Ch\u1ecdn \u0111\u00e1p \u00e1n C: L\u1ef1c k\u1ebf d\u00f9ng \u0111\u1ec3 \u0111o l\u1ef1c. C\u00f2n c\u00e2n d\u00f9ng \u0111\u1ec3 \u0111o kh\u1ed1i l\u01b0\u1ee3ng.<\/p>\n\n\n\n<p>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng<\/p>\n\n\n\n<p>B\u00e0i 6: Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 \u0111\u00fang?<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch ch\u1ea5t \u0111\u00f3.<\/p>\n\n\n\n<p>N\u00f3i kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a s\u1eaft l\u00e0 7800kg\/m3 c\u00f3 ngh\u0129a l\u00e0 1cm3 s\u1eaft c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 7800kg.<\/p>\n\n\n\n<p>C\u00f4ng th\u1ee9c t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 D = m.V.<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang b\u1eb1ng tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang.<\/p>\n\n\n\n<p>\u0110\u00e1p \u00e1n<\/p>\n\n\n\n<p>\u2013 N\u00f3i kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a s\u1eaft l\u00e0 7800kg\/m3 c\u00f3 ngh\u0129a l\u00e0 1m3 s\u1eaft c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 7800kg \u21d2 B sai.<\/p>\n\n\n\n<p>\u2013 C\u00f4ng th\u1ee9c t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang\u21d2 C sai<\/p>\n\n\n\n<p>\u2013 Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang D kh\u00e1c tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang d \u21d2 D sai<\/p>\n\n\n\n<p>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A: Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch ch\u1ea5t \u0111\u00f3.<\/p>\n\n\n\n<p>B\u00e0i t\u1eadp li\u00ean h\u1ec7<\/p>\n\n\n\n<p>B\u00e0i 7: G\u1ecdi d v\u00e0 D l\u1ea7n l\u01b0\u1ee3t l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang. M\u1ed1i li\u00ean h\u1ec7 gi\u1eefa d v\u00e0 D l\u00e0:<\/p>\n\n\n\n<p>D = 10d<\/p>\n\n\n\n<p>d = 10D<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang<\/p>\n\n\n\n<p>D + d = 10<\/p>\n\n\n\n<p>\u0110\u00e1p \u00e1n<\/p>\n\n\n\n<p>\u2013 Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang<\/p>\n\n\n\n<p>\u2013 Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang<\/p>\n\n\n\n<p>\u21d2 \u0110\u00e1p \u00e1n B<\/p>\n\n\n\n<p>B\u00e0i 8: Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0o sau \u0111\u00e2y x\u1ea3y ra \u0111\u1ed1i v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc khi \u0111un n\u01b0\u1edbc trong m\u1ed9t b\u00ecnh th\u1ee7y tinh?<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc t\u0103ng.<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc gi\u1ea3m.<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc kh\u00f4ng thay \u0111\u1ed5i.<\/p>\n\n\n\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00fac \u0111\u1ea7u gi\u1ea3m sau \u0111\u00f3 m\u1edbi t\u0103ng.<\/p>\n\n\n\n<p>\u0110\u00e1p \u00e1n<\/p>\n\n\n\n<p>Khi \u0111un n\u01b0\u1edbc s\u00f4i, th\u1ec3 t\u00edch n\u01b0\u1edbc t\u0103ng d\u1ea7n \u21d2 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang gi\u1ea3m \u21d2 \u0110\u00e1p \u00e1n B<\/p>\n\n\n\n<p>C\u00f3 th\u1ec3 n\u00f3i, nh\u1eefng \u0111i\u1ec1u ch\u00fang t\u00f4i \u0111\u1ec1 c\u1eadp tr\u00ean \u0111\u00e2y ch\u00ednh l\u00e0 nh\u1eefng ki\u1ebfn th\u1ee9c c\u00e1c em c\u1ea7n bi\u1ebft v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang. C\u1ea3m \u01a1n c\u00e1c em \u0111\u00e3 \u0111\u00f3n \u0111\u1ecdc b\u00e0i vi\u1ebft n\u00e0y. C\u00e1c em h\u00e3y ghi ch\u00e9p l\u1ea1i nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y \u0111\u1ec3 s\u1eed d\u1ee5ng gi\u1ea3i b\u00e0i t\u1eadp nh\u00e9!<\/p>\n\n\n\n<p>Ngo\u00e0i ra, ch\u00fang t\u00f4i c\u00f3 r\u1ea5t nhi\u1ec1u nh\u1eefng b\u00e0i vi\u1ebft m\u1edbi v\u1ec1 ch\u1ee7 \u0111\u1ec1u v\u1eadt l\u00fd l\u1edbp 6. C\u00e1c em h\u00e3y tham kh\u1ea3o ngay t\u1ea1i \u0111\u00e2y.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>T\u00ecm \u0111\u1ecdc th\u00eam c\u00e1c b\u00e0i vi\u1ebft kh\u00e1c<\/p><\/blockquote>\n\n\n\n<p>\u0110\u01a1n v\u1ecb \u0111o kh\u1ed1i l\u01b0\u1ee3ng \u2013 nh\u1eefng \u0111i\u1ec1u c\u1ea7n bi\u1ebft v\u1eadt l\u00fd 6?<\/p>\n\n\n\n<p>\u0110\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n kh\u1ed1i l\u01b0\u1ee3ng l\u1edbp 8 \u2013 D\u1ea1ng b\u00e0i t\u1eadp hay g\u1eb7p<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Gi\u1ed1ng nh\u01b0 kh\u1ed1i l\u01b0\u1ee3ng, v\u1ea1n v\u1eadt tr\u00ean tr\u00e1i \u0111\u1ea5t n\u00e0y \u0111\u1ec1u c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang. Ch\u00fang ta kh\u00f4ng th\u1ec3 t\u1ef1 nhi\u00ean x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y m\u00e0 c\u1ea7n ph\u1ea3i d\u1ef1a v\u00e0o quy tr\u00ecnh, t\u00ednh to\u00e1n. Trong b\u1ed9 m\u00f4n V\u1eadt l\u00fd, ch\u00fang ta s\u1ebd c\u00f3 [&hellip;]<\/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-1147","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\/1147","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=1147"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1147\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1147"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}