{"id":567149,"date":"2026-07-22T14:47:31","date_gmt":"2026-07-22T07:47:31","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=567149"},"modified":"2026-07-22T14:47:31","modified_gmt":"2026-07-22T07:47:31","slug":"khoi-luong-rieng","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/khoi-luong-rieng\/","title":{"rendered":"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c D = m\/V v\u00e0 b\u1ea3ng tra"},"content":{"rendered":"<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng cho bi\u1ebft m\u1ed9t m\u00e9t kh\u1ed1i ch\u1ea5t ch\u1ee9a bao nhi\u00eau kil\u00f4gam kh\u1ed1i l\u01b0\u1ee3ng, k\u00fd hi\u1ec7u D, t\u00ednh theo c\u00f4ng th\u1ee9c D = m\/V. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c n\u1ec1n trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00fd THCS, gi\u00fap tr\u1ea3 l\u1eddi nh\u1eefng c\u00e2u h\u1ecfi quen thu\u1ed9c nh\u01b0 v\u00ec sao d\u1ea7u \u0103n n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc hay v\u00ec sao con t\u00e0u b\u1eb1ng th\u00e9p n\u1eb7ng h\u00e0ng ngh\u00ecn t\u1ea5n v\u1eabn n\u1ed5i \u0111\u01b0\u1ee3c. B\u00e0i vi\u1ebft t\u1ed5ng h\u1ee3p c\u00f4ng th\u1ee9c, \u0111\u01a1n v\u1ecb \u0111o, b\u1ea3ng tra kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a c\u00e1c ch\u1ea5t quen thu\u1ed9c, c\u00e1ch ph\u00e2n bi\u1ec7t v\u1edbi tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang v\u00e0 v\u00ed d\u1ee5 t\u00ednh c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 b\u1ea1n \u00e1p d\u1ee5ng ngay v\u00e0o b\u00e0i t\u1eadp.<\/p>\n<h2>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec?<\/h2>\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a m\u1ed9t ch\u1ea5t l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng ch\u1ee9a trong m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch c\u1ee7a ch\u1ea5t \u0111\u00f3. \u0110\u00e2y l\u00e0 \u0111\u1eb7c tr\u01b0ng ri\u00eang c\u1ee7a t\u1eebng ch\u1ea5t, kh\u00f4ng ph\u1ee5 thu\u1ed9c h\u00ecnh d\u1ea1ng hay k\u00edch th\u01b0\u1edbc v\u1eadt: m\u1ed9t chi\u1ebfc \u0111inh s\u1eaft nh\u1ecf v\u00e0 m\u1ed9t thanh s\u1eaft l\u1edbn c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang nh\u01b0 nhau v\u00ec c\u00f9ng l\u00e0 s\u1eaft, d\u00f9 kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 th\u1ec3 t\u00edch kh\u00e1c nhau ho\u00e0n to\u00e0n.<\/p>\n<p>Nh\u1edd \u0111\u1eb7c \u0111i\u1ec3m n\u00e0y, kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 nh\u1eadn bi\u1ebft ch\u1ea5t li\u1ec7u \u2013 nh\u00f4m lu\u00f4n nh\u1eb9 h\u01a1n s\u1eaft \u1edf c\u00f9ng th\u1ec3 t\u00edch v\u00ec kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang nh\u1ecf h\u01a1n nhi\u1ec1u. Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u0169ng ph\u1ee5 thu\u1ed9c nh\u1eb9 v\u00e0o nhi\u1ec7t \u0111\u1ed9: ch\u1ea5t n\u1edf ra khi n\u00f3ng l\u00ean khi\u1ebfn th\u1ec3 t\u00edch t\u0103ng n\u00ean kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang gi\u1ea3m nh\u1eb9 d\u00f9 kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-568924 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-1.jpg\" alt=\"khoi-luong-rieng-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang<\/h2>\n<p>C\u00f4ng th\u1ee9c kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 D = m\/V, trong \u0111\u00f3 D l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 V l\u00e0 th\u1ec3 t\u00edch c\u1ee7a v\u1eadt.<\/p>\n<ul>\n<li>D: kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang, \u0111\u01a1n v\u1ecb kg\/m\u00b3<\/li>\n<li>m: kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt, \u0111\u01a1n v\u1ecb kg<\/li>\n<li>V: th\u1ec3 t\u00edch c\u1ee7a v\u1eadt, \u0111\u01a1n v\u1ecb m\u00b3<\/li>\n<\/ul>\n<p>T\u1eeb c\u00f4ng th\u1ee9c g\u1ed1c, suy ra hai c\u00f4ng th\u1ee9c hay d\u00f9ng khi gi\u1ea3i b\u00e0i t\u1eadp: m = D \u00d7 V \u0111\u1ec3 t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng, v\u00e0 V = m\/D \u0111\u1ec3 t\u00ednh th\u1ec3 t\u00edch. M\u1eb9o nh\u1edb nhanh: vi\u1ebft D, m, V v\u00e0o h\u00ecnh tam gi\u00e1c v\u1edbi m \u1edf \u0111\u1ec9nh tr\u00ean, D v\u00e0 V \u1edf hai g\u00f3c d\u01b0\u1edbi, che \u0111\u1ea1i l\u01b0\u1ee3ng c\u1ea7n t\u00ecm l\u00e0 ra c\u00f4ng th\u1ee9c t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-568925 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-2.jpg\" alt=\"khoi-luong-rieng-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u0110\u01a1n v\u1ecb c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang<\/h2>\n<p>\u0110\u01a1n v\u1ecb chu\u1ea9n c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang trong h\u1ec7 \u0111o l\u01b0\u1eddng qu\u1ed1c t\u1ebf SI l\u00e0 kil\u00f4gam tr\u00ean m\u00e9t kh\u1ed1i (kg\/m\u00b3). Trong ph\u00f2ng th\u00ed nghi\u1ec7m ho\u1eb7c s\u00e1ch gi\u00e1o khoa, kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u00f2n hay bi\u1ec3u di\u1ec5n b\u1eb1ng gam tr\u00ean xentim\u00e9t kh\u1ed1i (g\/cm\u00b3) v\u00ec con s\u1ed1 g\u1ecdn h\u01a1n v\u1edbi v\u1eadt nh\u1ecf.<\/p>\n<p>Quy \u0111\u1ed5i: 1g\/cm\u00b3 = 1000kg\/m\u00b3. \u0110\u1ed5i t\u1eeb g\/cm\u00b3 sang kg\/m\u00b3 th\u00ec nh\u00e2n 1000, \u0111\u1ed5i ng\u01b0\u1ee3c l\u1ea1i th\u00ec chia cho 1000. V\u00ed d\u1ee5, kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 1g\/cm\u00b3, quy \u0111\u1ed5i ra 1000kg\/m\u00b3 \u2013 \u0111\u00fang gi\u00e1 tr\u1ecb quen d\u00f9ng trong s\u00e1ch gi\u00e1o khoa.<\/p>\n<h2>B\u1ea3ng kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang m\u1ed9t s\u1ed1 ch\u1ea5t th\u01b0\u1eddng g\u1eb7p<\/h2>\n<p>B\u1ea3ng tra d\u01b0\u1edbi \u0111\u00e2y s\u1eafp x\u1ebfp c\u00e1c ch\u1ea5t quen thu\u1ed9c t\u1eeb nh\u1eb9 \u0111\u1ebfn n\u1eb7ng, b\u1ea1n c\u00f3 th\u1ec3 l\u01b0u l\u1ea1i \u0111\u1ec3 tra c\u1ee9u khi l\u00e0m b\u00e0i.<\/p>\n<table>\n<thead>\n<tr>\n<th>Ch\u1ea5t<\/th>\n<th>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang D (kg\/m\u00b3)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u1ea7u \u0103n<\/td>\n<td>\u2248 800<\/td>\n<\/tr>\n<tr>\n<td>N\u01b0\u1edbc \u0111\u00e1<\/td>\n<td>\u2248 900<\/td>\n<\/tr>\n<tr>\n<td>N\u01b0\u1edbc (4\u00b0C)<\/td>\n<td>1.000<\/td>\n<\/tr>\n<tr>\n<td>Nh\u00f4m<\/td>\n<td>2.700<\/td>\n<\/tr>\n<tr>\n<td>S\u1eaft, th\u00e9p<\/td>\n<td>7.800<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed3ng<\/td>\n<td>8.900<\/td>\n<\/tr>\n<tr>\n<td>Ch\u00ec<\/td>\n<td>11.300<\/td>\n<\/tr>\n<tr>\n<td>Th\u1ee7y ng\u00e2n<\/td>\n<td>13.600<\/td>\n<\/tr>\n<tr>\n<td>V\u00e0ng<\/td>\n<td>19.300<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>N\u01b0\u1edbc \u0111\u00e1 nh\u1eb9 h\u01a1n n\u01b0\u1edbc l\u1ecfng n\u00ean \u0111\u00e1 lu\u00f4n n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc \u2013 kh\u00e1 \u0111\u1eb7c bi\u1ec7t v\u00ec ph\u1ea7n l\u1edbn ch\u1ea5t r\u1eafn n\u1eb7ng h\u01a1n d\u1ea1ng l\u1ecfng c\u1ee7a ch\u00ednh n\u00f3. V\u00e0ng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u1edbn nh\u1ea5t b\u1ea3ng, g\u1ea5p g\u1ea7n 24 l\u1ea7n d\u1ea7u \u0103n n\u00ean m\u1ed9t ch\u1ec9 v\u00e0ng d\u00f9 nh\u1ecf v\u1eabn c\u1ea7m kh\u00e1 n\u1eb7ng tay. S\u1ed1 li\u1ec7u \u0111o \u1edf \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng, c\u00f3 th\u1ec3 ch\u00eanh l\u1ec7ch nh\u1eb9 t\u00f9y \u0111\u1ed9 tinh khi\u1ebft.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-568926 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-3.jpg\" alt=\"khoi-luong-rieng-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Ph\u00e2n bi\u1ec7t kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang<\/h2>\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang (D) v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang (d) li\u00ean h\u1ec7 ch\u1eb7t ch\u1ebd nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t. Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang D = m\/V, \u0111\u01a1n v\u1ecb kg\/m\u00b3, cho bi\u1ebft kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch. Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang d = P\/V, \u0111\u01a1n v\u1ecb N\/m\u00b3, cho bi\u1ebft tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch. V\u00ec P = m \u00d7 g n\u00ean d = D \u00d7 g; theo quy \u01b0\u1edbc s\u00e1ch gi\u00e1o khoa l\u1ea5y g \u2248 10 m\/s\u00b2, c\u00f4ng th\u1ee9c th\u01b0\u1eddng vi\u1ebft g\u1ecdn l\u00e0 d = 10D.<\/p>\n<p>V\u00ed d\u1ee5 v\u1edbi n\u01b0\u1edbc: D = 1000kg\/m\u00b3 th\u00ec d = 10 \u00d7 1000 = 10.000N\/m\u00b3. Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang \u0111o b\u1eb1ng c\u00e2n k\u1ebft h\u1ee3p \u0111o th\u1ec3 t\u00edch, c\u00f2n tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang \u0111o b\u1eb1ng l\u1ef1c k\u1ebf v\u00ec li\u00ean quan l\u1ef1c h\u00fat Tr\u00e1i \u0110\u1ea5t \u2013 \u1edf n\u01a1i tr\u1ecdng l\u1ef1c kh\u00e1c (nh\u01b0 M\u1eb7t Tr\u0103ng), tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a c\u00f9ng m\u1ed9t ch\u1ea5t s\u1ebd thay \u0111\u1ed5i trong khi kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang g\u1ea7n nh\u01b0 kh\u00f4ng \u0111\u1ed5i.<\/p>\n<h2>V\u00ed d\u1ee5 t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc<\/h2>\n<p><strong>\u0110\u1ec1 b\u00e0i:<\/strong> M\u1ed9t kh\u1ed1i kim lo\u1ea1i \u0111\u1eb7c c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng 3,9kg, th\u1ec3 t\u00edch \u0111o \u0111\u01b0\u1ee3c 500cm\u00b3. T\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang v\u00e0 cho bi\u1ebft \u0111\u00f3 c\u00f3 th\u1ec3 l\u00e0 ch\u1ea5t g\u00ec.<\/p>\n<p><strong>L\u1eddi gi\u1ea3i:<\/strong><\/p>\n<ul>\n<li>\u0110\u1ed5i th\u1ec3 t\u00edch v\u1ec1 m\u00b3: 500cm\u00b3 = 500 : 1.000.000 = 0,0005m\u00b3.<\/li>\n<li>\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c: D = m\/V = 3,9 : 0,0005 = 7.800kg\/m\u00b3.<\/li>\n<li>\u0110\u1ed1i chi\u1ebfu b\u1ea3ng tra: 7.800kg\/m\u00b3 tr\u00f9ng kh\u1edbp kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a s\u1eaft, th\u00e9p. V\u1eady kh\u1ed1i kim lo\u1ea1i nhi\u1ec1u kh\u1ea3 n\u0103ng l\u00e0 s\u1eaft ho\u1eb7c th\u00e9p.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-568927 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-4.jpg\" alt=\"khoi-luong-rieng-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<p><strong>B\u00e0i 1:<\/strong> M\u1ed9t chai ch\u1ee9a 900ml d\u1ea7u \u0103n, c\u00e2n \u0111\u01b0\u1ee3c kh\u1ed1i l\u01b0\u1ee3ng d\u1ea7u (\u0111\u00e3 tr\u1eeb v\u1ecf chai) l\u00e0 720g. T\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a d\u1ea7u \u0103n theo kg\/m\u00b3.<\/p>\n<ul>\n<li>\u0110\u1ed5i: 900ml = 0,0009m\u00b3; 720g = 0,72kg.<\/li>\n<li>D = m\/V = 0,72 : 0,0009 = 800kg\/m\u00b3, \u0111\u00fang b\u1eb1ng kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang d\u1ea7u \u0103n trong b\u1ea3ng tra.<\/li>\n<\/ul>\n<p><strong>B\u00e0i 2:<\/strong> M\u1ed9t kh\u1ed1i \u0111\u1ed3ng \u0111\u1eb7c th\u1ec3 t\u00edch 250cm\u00b3. Bi\u1ebft kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a \u0111\u1ed3ng l\u00e0 8.900kg\/m\u00b3, t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang c\u1ee7a kh\u1ed1i \u0111\u1ed3ng.<\/p>\n<ul>\n<li>\u0110\u1ed5i: 250cm\u00b3 = 0,00025m\u00b3.<\/li>\n<li>m = D \u00d7 V = 8.900 \u00d7 0,00025 = 2,225kg; d = 10D = 89.000N\/m\u00b3.<\/li>\n<\/ul>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang trong \u0111\u1eddi s\u1ed1ng<\/h2>\n<p>K\u1ef9 s\u01b0 d\u1ef1a v\u00e0o kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang \u0111\u1ec3 ch\u1ecdn v\u1eadt li\u1ec7u: nh\u00f4m nh\u1eb9 (2.700kg\/m\u00b3) \u01b0u ti\u00ean l\u00e0m v\u1ecf m\u00e1y bay, khung xe, v\u1ecf \u0111i\u1ec7n tho\u1ea1i; th\u00e9p n\u1eb7ng h\u01a1n (7.800kg\/m\u00b3) d\u00f9ng cho k\u1ebft c\u1ea5u ch\u1ecbu l\u1ef1c. V\u1ecf t\u00e0u bi\u1ec3n l\u00e0m b\u1eb1ng th\u00e9p nh\u01b0ng thi\u1ebft k\u1ebf r\u1ed7ng v\u1edbi nhi\u1ec1u khoang kh\u00f4ng kh\u00ed n\u00ean kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang trung b\u00ecnh c\u1ea3 con t\u00e0u nh\u1ecf h\u01a1n n\u01b0\u1edbc bi\u1ec3n, nh\u1edd \u0111\u00f3 t\u00e0u v\u1eabn n\u1ed5i d\u00f9 th\u00e9p \u0111\u1eb7c th\u00ec ch\u00ecm.<\/p>\n<p>Th\u1ee3 kim ho\u00e0n d\u00f9ng kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang \u0111\u1ec3 ki\u1ec3m tra v\u00e0ng th\u1eadt \u2013 gi\u1ea3: \u0111o ra con s\u1ed1 th\u1ea5p h\u01a1n 19.300kg\/m\u00b3 nhi\u1ec1u th\u00ec kh\u1ea3 n\u0103ng cao v\u00e0ng \u0111\u00e3 b\u1ecb pha t\u1ea1p ch\u1ea5t. \u0110\u00e2y c\u0169ng l\u00e0 ki\u1ebfn th\u1ee9c li\u00ean h\u1ec7 g\u1ea7n v\u1edbi <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/nhiet-dung-rieng\/\">nhi\u1ec7t dung ri\u00eang<\/a> \u2013 \u0111\u1ea1i l\u01b0\u1ee3ng th\u01b0\u1eddng d\u00f9ng c\u00f9ng kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang khi t\u00ednh kh\u1ea3 n\u0103ng truy\u1ec1n nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-568928 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-5.jpg\" alt=\"khoi-luong-rieng-5\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1ch x\u00e1c \u0111\u1ecbnh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang b\u1eb1ng th\u1ef1c nghi\u1ec7m<\/h2>\n<p>\u0110o kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang g\u1ed3m hai b\u01b0\u1edbc: \u0111o kh\u1ed1i l\u01b0\u1ee3ng b\u1eb1ng c\u00e2n (gam ho\u1eb7c kil\u00f4gam), r\u1ed3i \u0111o th\u1ec3 t\u00edch. V\u1eadt h\u00ecnh d\u1ea1ng \u0111\u1ec1u (kh\u1ed1i h\u1ed9p, h\u00ecnh tr\u1ee5&#8230;) \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c h\u00ecnh h\u1ecdc; v\u1eadt h\u00ecnh d\u1ea1ng b\u1ea5t k\u1ef3 th\u00ec d\u00f9ng b\u00ecnh chia \u0111\u1ed9, th\u1ea3 ch\u00ecm v\u1eadt v\u00e0o n\u01b0\u1edbc v\u00e0 l\u1ea5y ph\u1ea7n th\u1ec3 t\u00edch n\u01b0\u1edbc d\u00e2ng l\u00ean. Cu\u1ed1i c\u00f9ng \u0111\u1ed5i kh\u1ed1i l\u01b0\u1ee3ng, th\u1ec3 t\u00edch v\u1ec1 c\u00f9ng h\u1ec7 \u0111\u01a1n v\u1ecb (kg, m\u00b3) r\u1ed3i \u00e1p d\u1ee5ng D = m\/V \u2013 nh\u1ea7m gi\u1eefa cm\u00b3 v\u00e0 m\u00b3 l\u00e0 l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t khi l\u00e0m b\u00e0i.<\/p>\n<p>N\u1ebfu mu\u1ed1n \u00f4n th\u00eam c\u00f4ng th\u1ee9c V\u1eadt l\u00fd c\u01a1 b\u1ea3n kh\u00e1c, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-van-toc\/\">c\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c<\/a> ho\u1eb7c b\u00e0i v\u1ec1 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/noi-nang-la-gi\/\">n\u1ed9i n\u0103ng<\/a>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-568929 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-6.jpg\" alt=\"khoi-luong-rieng-6\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/khoi-luong-rieng-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang<\/h2>\n<p><strong>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec?<\/strong><br \/>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng ch\u1ee9a trong m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch c\u1ee7a m\u1ed9t ch\u1ea5t, k\u00fd hi\u1ec7u D, \u0111\u01a1n v\u1ecb kg\/m\u00b3, t\u00ednh theo c\u00f4ng th\u1ee9c D = m\/V.<\/p>\n<p><strong>C\u00f4ng th\u1ee9c t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang nh\u01b0 th\u1ebf n\u00e0o?<\/strong><br \/>D = m\/V; suy ra m = D \u00d7 V v\u00e0 V = m\/D. Trong \u0111\u00f3 D t\u00ednh b\u1eb1ng kg\/m\u00b3, m b\u1eb1ng kg, V b\u1eb1ng m\u00b3.<\/p>\n<p><strong>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 bao nhi\u00eau?<\/strong><br \/>N\u01b0\u1edbc \u1edf \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang kho\u1ea3ng 1.000kg\/m\u00b3 (1g\/cm\u00b3). N\u01b0\u1edbc \u0111\u00e1 nh\u1eb9 h\u01a1n, kho\u1ea3ng 900kg\/m\u00b3, n\u00ean n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc.<\/p>\n<p><strong>1g\/cm\u00b3 b\u1eb1ng bao nhi\u00eau kg\/m\u00b3?<\/strong><br \/>1g\/cm\u00b3 = 1.000kg\/m\u00b3. \u0110\u1ed5i t\u1eeb g\/cm\u00b3 sang kg\/m\u00b3 th\u00ec nh\u00e2n 1.000, \u0111\u1ed5i ng\u01b0\u1ee3c l\u1ea1i th\u00ec chia cho 1.000.<\/p>\n<p><strong>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang kh\u00e1c tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang \u1edf \u0111i\u1ec3m n\u00e0o?<\/strong><br \/>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang D l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng tr\u00ean th\u1ec3 t\u00edch (kg\/m\u00b3). Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang d l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng tr\u00ean th\u1ec3 t\u00edch (N\/m\u00b3), li\u00ean h\u1ec7 qua d = 10D (l\u1ea5y g \u2248 10 m\/s\u00b2 theo quy \u01b0\u1edbc SGK).<\/p>\n<p><strong>L\u00e0m sao \u0111o kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a v\u1eadt c\u00f3 h\u00ecnh d\u1ea1ng b\u1ea5t k\u1ef3?<\/strong><br \/>D\u00f9ng c\u00e2n \u0111o kh\u1ed1i l\u01b0\u1ee3ng, d\u00f9ng b\u00ecnh chia \u0111\u1ed9 \u0111o th\u1ec3 t\u00edch b\u1eb1ng c\u00e1ch th\u1ea3 v\u1eadt ng\u1eadp n\u01b0\u1edbc v\u00e0 \u0111o ph\u1ea7n n\u01b0\u1edbc d\u00e2ng l\u00ean, sau \u0111\u00f3 \u00e1p d\u1ee5ng D = m\/V.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang D = m\/V l\u00e0 c\u00f4ng th\u1ee9c n\u1ec1n t\u1ea3ng gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh ch\u1ea5t li\u1ec7u, ki\u1ec3m tra \u0111\u1ed9 tinh khi\u1ebft v\u00e0 t\u00ednh nhanh kh\u1ed1i l\u01b0\u1ee3ng hay th\u1ec3 t\u00edch khi bi\u1ebft \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f2n l\u1ea1i. Ghi nh\u1edb b\u1ea3ng tra v\u00e0 ph\u00e2n bi\u1ec7t r\u00f5 v\u1edbi tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang (d = 10D) s\u1ebd gi\u00fap b\u1ea1n l\u00e0m b\u00e0i ch\u00ednh x\u00e1c v\u00e0 nhanh h\u01a1n. Hy v\u1ecdng c\u00f4ng th\u1ee9c, b\u1ea3ng tra v\u00e0 c\u00e1c v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i \u1edf tr\u00ean \u0111\u00e3 gi\u00fap b\u1ea1n n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c n\u00e0y \u0111\u1ec3 \u00e1p d\u1ee5ng v\u00e0o b\u00e0i t\u1eadp v\u00e0 \u0111\u1eddi s\u1ed1ng h\u1eb1ng ng\u00e0y.<\/p>\n<p><script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng ch\u1ee9a trong m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ec3 t\u00edch c\u1ee7a m\u1ed9t ch\u1ea5t, k\u00fd hi\u1ec7u D, \u0111\u01a1n v\u1ecb kg\/m3, t\u00ednh theo c\u00f4ng th\u1ee9c D = m\/V.\"}},{\"@type\":\"Question\",\"name\":\"C\u00f4ng th\u1ee9c t\u00ednh kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang nh\u01b0 th\u1ebf n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"D = m\/V; suy ra m = D x V v\u00e0 V = m\/D. Trong \u0111\u00f3 D t\u00ednh b\u1eb1ng kg\/m3, m b\u1eb1ng kg, V b\u1eb1ng m3.\"}},{\"@type\":\"Question\",\"name\":\"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a n\u01b0\u1edbc l\u00e0 bao nhi\u00eau?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"N\u01b0\u1edbc \u1edf \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang kho\u1ea3ng 1000kg\/m3 (1g\/cm3). N\u01b0\u1edbc \u0111\u00e1 nh\u1eb9 h\u01a1n, kho\u1ea3ng 900kg\/m3, n\u00ean n\u1ed5i tr\u00ean m\u1eb7t n\u01b0\u1edbc.\"}},{\"@type\":\"Question\",\"name\":\"1g\/cm3 b\u1eb1ng bao nhi\u00eau kg\/m3?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"1g\/cm3 = 1000kg\/m3. \u0110\u1ed5i t\u1eeb g\/cm3 sang kg\/m3 th\u00ec nh\u00e2n 1000, \u0111\u1ed5i ng\u01b0\u1ee3c l\u1ea1i th\u00ec chia cho 1000.\"}},{\"@type\":\"Question\",\"name\":\"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang kh\u00e1c tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang \u1edf \u0111i\u1ec3m n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang D l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng tr\u00ean th\u1ec3 t\u00edch (kg\/m3). Tr\u1ecdng l\u01b0\u1ee3ng ri\u00eang d l\u00e0 tr\u1ecdng l\u01b0\u1ee3ng tr\u00ean th\u1ec3 t\u00edch (N\/m3), li\u00ean h\u1ec7 qua d = 10D theo quy \u01b0\u1edbc SGK l\u1ea5y g x\u1ea5p x\u1ec9 10 m\/s2.\"}},{\"@type\":\"Question\",\"name\":\"L\u00e0m sao \u0111o kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a v\u1eadt c\u00f3 h\u00ecnh d\u1ea1ng b\u1ea5t k\u1ef3?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"D\u00f9ng c\u00e2n \u0111o kh\u1ed1i l\u01b0\u1ee3ng, d\u00f9ng b\u00ecnh chia \u0111\u1ed9 \u0111o th\u1ec3 t\u00edch b\u1eb1ng c\u00e1ch th\u1ea3 v\u1eadt ng\u1eadp n\u01b0\u1edbc v\u00e0 \u0111o ph\u1ea7n n\u01b0\u1edbc d\u00e2ng l\u00ean, sau \u0111\u00f3 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c D = m\/V.\"}}]}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng cho bi\u1ebft m\u1ed9t m\u00e9t kh\u1ed1i ch\u1ea5t ch\u1ee9a bao nhi\u00eau kil\u00f4gam kh\u1ed1i l\u01b0\u1ee3ng, k\u00fd hi\u1ec7u D, t\u00ednh theo c\u00f4ng th\u1ee9c D = m\/V. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c n\u1ec1n trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00fd THCS, gi\u00fap tr\u1ea3 l\u1eddi nh\u1eefng c\u00e2u h\u1ecfi quen thu\u1ed9c nh\u01b0 v\u00ec sao d\u1ea7u \u0103n n\u1ed5i tr\u00ean m\u1eb7t [&hellip;]<\/p>\n","protected":false},"author":65,"featured_media":568923,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang","_yoast_wpseo_title":"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c D = m\/V","_yoast_wpseo_metadesc":"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c D = m\/V, b\u1ea3ng tra kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang n\u01b0\u1edbc, s\u1eaft, \u0111\u1ed3ng, v\u00e0ng v\u00e0 v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft. Xem ngay t\u1ea1i Ho\u00e0ng H\u00e0 Mobile.","footnotes":""},"categories":[16],"tags":[],"class_list":["post-567149","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thu-thuat"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c D = m\/V<\/title>\n<meta name=\"description\" content=\"Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec? 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