{"id":37597,"date":"2025-12-16T00:56:58","date_gmt":"2025-12-15T22:56:58","guid":{"rendered":"https:\/\/www.cpge-brizeux.fr\/wordpress\/non-classe\/phenomenes-de-transport-3-diffusion-de-particules.html"},"modified":"2025-12-16T00:59:21","modified_gmt":"2025-12-15T22:59:21","slug":"phenomenes-de-transport-3-diffusion-de-particules","status":"publish","type":"post","link":"https:\/\/www.cpge-brizeux.fr\/wordpress\/psi\/physchim-psi-2526\/phenomenes-de-transport-3-diffusion-de-particules.html","title":{"rendered":"Ph\u00e9nom\u00e8nes de transport 3 : Diffusion de particules"},"content":{"rendered":"<h2>T\u00e9l\u00e9chargements<\/h2>\n<p><a href='https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-content\/uploads\/phenomenes-de-transport-3-diffusion-de-particules-poly.pdf'>Polycopi\u00e9<\/a><\/p>\n<p><a href='https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-content\/uploads\/phenomenes-de-transport-3-diffusion-de-particules-flashcards.apkg'>Flashcards Anki<\/a><\/p>\n<h2>Coups de pouce<\/h2>\n<p>Laisser la souris\/taper sur le texte pour l&rsquo;afficher.<\/p>\n<div class='coups-de-pouce'>\n<h5>Exercice 1<\/h5>\n<ol>\n<li>\n<ul>\n<li>\n    Attention \u00e0 ne pas confondre la quantit\u00e9 de mati\u00e8re et la densit\u00e9 particulaire, toutes deux not\u00e9es fr\u00e9quemment <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.6em; height: 0.683em;\" viewBox=\"0 0 6.6 7.513000000000001\" width=\"6.6pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#gE2B7E3D264F2F7FB4E5DAE10F9857908\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"gE2B7E3D264F2F7FB4E5DAE10F9857908\" overflow=\"visible\"><path d=\"M 0 0m 5.907 1.507 c -0.25300026 -0.86899996 -0.6160002 -1.309 -1.0669999 -1.309 c -0.14300013 0 -0.22000027 0.11 -0.22000027 0.319 c 0 0.15399998 0.065999985 0.407 0.19799995 0.74799997 c 0.44000006 1.199 0.6600003 1.991 0.6600003 2.3979998 c 0 0.7700002 -0.5170002 1.1990001 -1.2870002 1.1990001 c -0.6489999 0 -1.21 -0.28599977 -1.661 -0.86899996 c -0.08800006 0.48399973 -0.47300005 0.86899996 -1.0339999 0.86899996 c -0.61600006 0 -0.85800004 -0.572 -1.0120001 -1.0669999 c -0.109999985 -0.352 -0.16499999 -0.5610001 -0.16499999 -0.638 c 0 -0.09899998 0.055000007 -0.15400004 0.176 -0.15400004 c 0.055000007 0 0.088 0.010999918 0.12099999 0.032999992 c 0.055000007 0.09899998 0.088 0.17599988 0.09899998 0.25300002 c 0.19800001 0.83599997 0.45100003 1.2539997 0.74799997 1.2539997 c 0.19800007 0 0.29700005 -0.1539998 0.29700005 -0.4619999 c 0 -0.14299989 -0.054999948 -0.43999982 -0.176 -0.8909998 l -0.627 -2.497 c -0.032999992 -0.143 -0.09900004 -0.42900002 -0.09900004 -0.48400003 c 0 -0.22 0.12099999 -0.32999998 0.36299998 -0.32999998 c 0.20899999 0 0.36300004 0.11 0.44000006 0.32999998 c 0.021999955 0.055000007 0.08799994 0.32999998 0.20899999 0.803 l 0.23100007 0.979 l 0.32999992 1.254 c 0.12100005 0.25300002 0.3080001 0.50600004 0.53900003 0.77 c 0.319 0.35200024 0.7149999 0.5279999 1.188 0.5279999 c 0.36299992 0 0.53900003 -0.24199963 0.53900003 -0.7149997 c 0 -0.41799998 -0.23099995 -1.2540002 -0.704 -2.5080001 c -0.07700014 -0.19799995 -0.11000013 -0.36299992 -0.11000013 -0.5059999 c 0 -0.53900003 0.40700006 -0.935 0.93499994 -0.935 c 0.4840002 0 0.86899996 0.275 1.144 0.825 c 0.20900011 0.44000006 0.31900024 0.737 0.31900024 0.88 c 0 0.09899998 -0.055000305 0.15400004 -0.17600012 0.15400004 c -0.032999992 0 -0.19799995 -0.0990001 -0.19799995 -0.23100007 Z \"\/><\/symbol><\/defs><\/svg><\/span>.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Le mod\u00e8le propos\u00e9 ressemble au mod\u00e8le de Drude. Appliquer la loi de la quantit\u00e9 de mouvement en r\u00e9gime stationnaire.\n  <\/li>\n<li>\n    Relier la vitesse au vecteur densit\u00e9 de courant de particules.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Faire un bilan de particules sur une tranche infinit\u00e9simale d\u2019atmosph\u00e8re. 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l\u2019infini et le flux particulaire.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    La consommation de <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 1.3442999999999998em; height: 0.683em;\" viewBox=\"0 0 14.787299999999998 7.513000000000001\" width=\"14.787299999999998pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0.616 7.513000000000001)\"><use xlink:href=\"#g1E8E302BA1B610A17B20C2BF04F1AA8E\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 9.174 10.3114)\"><use xlink:href=\"#g782E79E6A0C99FA5B4FCE635BCE4F42C\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g1E8E302BA1B610A17B20C2BF04F1AA8E\" overflow=\"visible\"><path d=\"M 0 0m 4.268 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-0.7853999 -0.12319994 -1.1011 -0.3696003 c -0.3311 -0.26949978 -0.50049996 -0.60829973 -0.50049996 -1.0240998 c 0 -0.26180005 0.19250003 -0.45429993 0.4312 -0.45429993 Z \"\/><\/symbol><\/defs><\/svg><\/span> de la bact\u00e9rie est le flux particulaire d\u2019<span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 1.3442999999999998em; height: 0.683em;\" viewBox=\"0 0 14.787299999999998 7.513000000000001\" width=\"14.787299999999998pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0.616 7.513000000000001)\"><use xlink:href=\"#g1E8E302BA1B610A17B20C2BF04F1AA8E\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 9.174 10.3114)\"><use xlink:href=\"#g782E79E6A0C99FA5B4FCE635BCE4F42C\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g1E8E302BA1B610A17B20C2BF04F1AA8E\" overflow=\"visible\"><path d=\"M 0 0m 4.268 -0.242 c 1.0559998 0 1.9359999 0.407 2.6399999 1.21 c 0.68200016 0.77000004 1.0229998 1.694 1.0229998 2.7610002 c 0 1.0669999 -0.3409996 2.0019999 -1.0119996 2.783 c -0.71500015 0.8249998 -1.5950003 1.243 -2.651 1.243 c -1.0560002 0 -1.9360001 -0.41800022 -2.64 -1.243 c -0.671 -0.78100014 -1.0120001 -1.7160001 -1.0120001 -2.783 c 0 -1.0670002 0.34100002 -1.9800001 1.0120001 -2.7610002 c 0.7149999 -0.803 1.595 -1.21 2.64 -1.21 Z m 1.8589997 6.567 c 0.3959999 -0.5829997 0.59400034 -1.3969998 0.59400034 -2.442 c 0 -1.3529999 -0.28600025 -2.343 -0.8580003 -2.9589999 c -0.4949999 -0.528 -1.0229998 -0.79200006 -1.5840001 -0.79200006 c -0.5719998 0 -1.1109998 0.264 -1.6059997 0.803 c -0.5610001 0.616 -0.8470001 1.595 -0.8470001 2.948 c 0 1.309 0.29699993 2.255 0.89100003 2.816 c 0.50600004 0.4619999 1.023 0.6930003 1.5510001 0.6930003 c 0.74799967 0 1.3639998 -0.35200024 1.8589997 -1.0670004 Z \"\/><\/symbol><symbol id=\"g782E79E6A0C99FA5B4FCE635BCE4F42C\" overflow=\"visible\"><path d=\"M 0 0m 0.9163 3.2648 c 0.24639994 0 0.43119997 0.18479991 0.43119997 0.43120003 c 0 0.27719998 -0.14629996 0.42350006 -0.43119997 0.43120003 c 0.16940004 0.36189985 0.5544 0.6545 1.0548999 0.6545 c 0.6775999 0 1.1242001 -0.50820017 1.1242001 -1.1858001 c 0 -0.36960006 -0.13090014 -0.7238002 -0.40040016 -1.0703001 c -0.1308999 -0.17709994 -0.23099995 -0.30029988 -0.30029988 -0.36960006 l -1.8249 -1.8094999 c -0.10010001 -0.092400014 -0.08470002 -0.1155 -0.08470002 -0.3465 h 3.1724 l 0.23869991 1.4476 h -0.32340002 c -0.053900003 -0.4081 -0.11549997 -0.64680004 -0.18479991 -0.7007 c -0.03850007 -0.023100019 -0.27719998 -0.03850001 -0.7314999 -0.03850001 h -1.3090001 c 0.5159 0.45429993 0.9933001 0.86239994 1.4476 1.2243 c 0.34649992 0.2694999 0.59290004 0.50820005 0.7469001 0.71609986 c 0.23099995 0.30030012 0.34649992 0.6160002 0.34649992 0.94710016 c 0 0.47739983 -0.18479991 0.8547001 -0.56209993 1.1318998 c -0.3311 0.25409985 -0.7469001 0.38500023 -1.2397001 0.38500023 c -0.42349994 0 -0.7853999 -0.12319994 -1.1011 -0.3696003 c -0.3311 -0.26949978 -0.50049996 -0.60829973 -0.50049996 -1.0240998 c 0 -0.26180005 0.19250003 -0.45429993 0.4312 -0.45429993 Z \"\/><\/symbol><\/defs><\/svg><\/span> arrivant \u00e0 la bact\u00e9rie.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    La densit\u00e9 particulaire ne peut pas \u00eatre n\u00e9gative.\n  <\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h5>Exercice 3<\/h5>\n<ol>\n<li>\n<ul>\n<li>\n    Combien de neutrons sont capt\u00e9s durant <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.917em; height: 0.683em;\" viewBox=\"0 0 10.087 7.513000000000001\" width=\"10.087pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#g6AB1915B7693DCCD453F480CD5D1DEEA\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 6.1160000000000005 7.513000000000001)\"><use xlink:href=\"#g2EC5FD748B0BAD26277A02643D0FB967\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g6AB1915B7693DCCD453F480CD5D1DEEA\" overflow=\"visible\"><path d=\"M 0 0m 4.114 -0.121 l 1.6830001 0.121 v 0.41799998 c -0.3959999 0 -0.62699986 0.022000015 -0.71500015 0.088 c -0.08799982 0.066000044 -0.13199997 0.231 -0.13199997 0.48400003 v 6.644 l -1.6389999 -0.12099981 v -0.41800022 c 0.38500023 0 0.6270001 -0.032999992 0.71500015 -0.09899998 c 0.08799982 -0.065999985 0.12099981 -0.21999979 0.12099981 -0.47300005 v -2.2329998 c -0.35199976 0.40700006 -0.7919998 0.605 -1.3199999 0.605 c -0.6819999 0 -1.2649999 -0.2420001 -1.7379999 -0.737 c -0.473 -0.49500012 -0.715 -1.089 -0.715 -1.7820001 c 0 -0.6709999 0.21999997 -1.254 0.67099994 -1.749 c 0.4510001 -0.49499997 1.001 -0.74799997 1.672 -0.74799997 c 0.5609999 0 1.0339999 0.20899999 1.3969998 0.638 Z m -1.2429998 4.686 c 0.4729998 0 0.85800004 -0.20900011 1.1330001 -0.6270001 c 0.076999664 -0.12100005 0.10999966 -0.24199986 0.10999966 -0.385 v -2.2220001 c 0 -0.143 -0.032999992 -0.26399994 -0.10999966 -0.385 c -0.3080001 -0.49499997 -0.7260003 -0.737 -1.2430003 -0.737 c -0.45099998 0 -0.8139999 0.22 -1.0999999 0.671 c -0.19800007 0.33000004 -0.29700005 0.82500005 -0.29700005 1.485 c 0 1.1989999 0.40700006 2.2 1.5070001 2.2 Z \"\/><\/symbol><symbol id=\"g2EC5FD748B0BAD26277A02643D0FB967\" overflow=\"visible\"><path d=\"M 0 0m 3.6299999 4.609 c 0 0.09899998 -0.109999895 0.1539998 -0.34099984 0.1539998 h -0.89100003 c 0.286 1.144 0.4289999 1.7379999 0.4289999 1.7820001 c 0 0.23099995 -0.12099981 0.34100008 -0.352 0.34100008 c -0.25300002 0 -0.40699983 -0.14300013 -0.4729998 -0.42900038 l -0.40700006 -1.6939998 h -0.97900003 c -0.24199998 0 -0.363 -0.011000156 -0.363 -0.2420001 c 0 -0.12099981 0.110000014 -0.17600012 0.341 -0.17600012 h 0.89100003 c -0.53900003 -2.1449997 -0.80300003 -3.2779999 -0.80300003 -3.4209998 c 0 -0.61600006 0.41800004 -1.0450001 1.0339999 -1.0450001 c 0.4180001 0 0.781 0.187 1.1 0.572 c 0.26399994 0.31899998 0.45099998 0.627 0.572 0.924 c 0.04399991 0.12100005 0.065999985 0.18700004 0.065999985 0.22000003 c 0 0.09899998 -0.055000067 0.15399992 -0.16499996 0.15399992 c -0.08800006 0 -0.15400004 -0.054999948 -0.19799995 -0.176 c -0.37400007 -0.913 -0.82500005 -1.364 -1.3640001 -1.364 c -0.18700004 0 -0.286 0.15400001 -0.286 0.45099998 c 0 0.16500002 0.021999955 0.34100008 0.065999985 0.5170001 l 0.78100014 3.1679997 h 0.97899985 c 0.286 0 0.36299992 0.022000313 0.36299992 0.26400042 Z \"\/><\/symbol><\/defs><\/svg><\/span> dans le volume consid\u00e9r\u00e9 ? Combien sont \u00e9mis ?\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Il faut proc\u00e9der par s\u00e9paration des variables.\n  <\/li>\n<li>\n    Remplacer <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.425em; height: 0.683em;\" viewBox=\"0 0 4.675 7.513000000000001\" width=\"4.675pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#g7E1B7610964C28DE51BCBF606EE90D00\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"g7E1B7610964C28DE51BCBF606EE90D00\" overflow=\"visible\"><path d=\"M 0 0m 4.367 6.831 c 0 0.29699993 -0.15400028 0.44000006 -0.4510002 0.44000006 c -0.30799985 0 -0.61599994 -0.3080001 -0.61599994 -0.6160002 c 0 -0.29699993 0.14300013 -0.43999958 0.44000006 -0.43999958 c 0.30799985 0 0.6270001 0.3079996 0.6270001 0.6159997 Z m -1.4300001 -1.947 c -0.58299994 0 -1.0780001 -0.44000006 -1.32 -0.8249998 c -0.29700005 -0.47300005 -0.43999994 -0.77 -0.43999994 -0.90199995 c 0 -0.09899998 0.054999948 -0.14300013 0.16499996 -0.14300013 c 0.054999948 0 0.08799994 0.011000156 0.12099993 0.022000074 c 0.055000067 0.08800006 0.08800006 0.16499996 0.12100005 0.22000003 c 0.352 0.86899996 0.79199994 1.2979999 1.32 1.2979999 c 0.19799995 0 0.29699993 -0.1539998 0.29699993 -0.45099974 c 0 -0.1650002 -0.022000074 -0.35200024 -0.0769999 -0.5500002 l -1.0120001 -4.059 c -0.15400004 -0.6380001 -0.594 -1.4189999 -1.287 -1.4189999 c -0.09899998 0 -0.19800001 0.010999918 -0.297 0.04399991 c 0.27499998 0.110000014 0.407 0.3080001 0.407 0.58300006 c 0 0.286 -0.15399998 0.42899996 -0.451 0.42899996 c -0.352 0 -0.627 -0.31899995 -0.627 -0.67099994 c 0 -0.48399997 0.473 -0.7149999 0.99 -0.7149999 c 0.47299993 0 0.913 0.16499996 1.32 0.4949999 c 0.385 0.319 0.62699986 0.72599995 0.7479999 1.199 l 1.0009999 3.9819999 c 0.032999992 0.14299989 0.055000067 0.286 0.055000067 0.41799998 c 0 0.6049998 -0.4289999 1.0449998 -1.0339999 1.0449998 Z \"\/><\/symbol><\/defs><\/svg><\/span> par la loi de Fick dans l\u2019\u00e9quation obtenue pr\u00e9c\u00e9demment.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Distinguer les cas sur le discriminent et utiliser les conditions aux limites pour trouver les constantes.\n  <\/li>\n<li>\n    La densit\u00e9 particulaire est une grandeur positive et finie.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    \u00c0 quelle condition la densit\u00e9 particulaire cro\u00eet-elle exponentiellement avec le temps ?\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<\/ul>\n<\/li>\n<\/ol>\n<h5>Exercice 4<\/h5>\n<ol>\n<li>\n<ul>\n<li>\n    Combien de neutrons sont capt\u00e9s durant <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; 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Combien sont \u00e9mis ?\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    Remplacer <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.6em; height: 0.683em;\" viewBox=\"0 0 6.6 7.513000000000001\" width=\"6.6pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#gE2B7E3D264F2F7FB4E5DAE10F9857908\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><\/g><defs id=\"glyph\"><symbol id=\"gE2B7E3D264F2F7FB4E5DAE10F9857908\" overflow=\"visible\"><path d=\"M 0 0m 5.907 1.507 c -0.25300026 -0.86899996 -0.6160002 -1.309 -1.0669999 -1.309 c -0.14300013 0 -0.22000027 0.11 -0.22000027 0.319 c 0 0.15399998 0.065999985 0.407 0.19799995 0.74799997 c 0.44000006 1.199 0.6600003 1.991 0.6600003 2.3979998 c 0 0.7700002 -0.5170002 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0.319 0.35200024 0.7149999 0.5279999 1.188 0.5279999 c 0.36299992 0 0.53900003 -0.24199963 0.53900003 -0.7149997 c 0 -0.41799998 -0.23099995 -1.2540002 -0.704 -2.5080001 c -0.07700014 -0.19799995 -0.11000013 -0.36299992 -0.11000013 -0.5059999 c 0 -0.53900003 0.40700006 -0.935 0.93499994 -0.935 c 0.4840002 0 0.86899996 0.275 1.144 0.825 c 0.20900011 0.44000006 0.31900024 0.737 0.31900024 0.88 c 0 0.09899998 -0.055000305 0.15400004 -0.17600012 0.15400004 c -0.032999992 0 -0.19799995 -0.0990001 -0.19799995 -0.23100007 Z \"\/><\/symbol><\/defs><\/svg><\/span> par <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 0.6115999999999999em; height: 0.683em;\" viewBox=\"0 0 6.7276 7.513000000000001\" width=\"6.7276pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 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-0.42350006 c 0 -0.18479991 0.14629984 -0.31570005 0.3311 -0.31570005 c 0.2617998 0 0.45429993 0.23100019 0.45429993 0.4928 Z \"\/><\/symbol><\/defs><\/svg><\/span> dans l\u2019\u00e9quation obtenue pr\u00e9c\u00e9demment.\n  <\/li>\n<\/ul>\n<\/li>\n<li>\n<ul>\n<li>\n    La densit\u00e9 particulaire doit rester finie en <span style=\"display: inline-block\"><svg class=\"typst-frame\" style=\"overflow: visible; width: 2.297555555555556em; height: 0.683em;\" viewBox=\"0 0 25.273111111111113 7.513000000000001\" width=\"25.273111111111113pt\" height=\"7.513000000000001pt\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xmlns:h5=\"http:\/\/www.w3.org\/1999\/xhtml\"><g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 0 7.513000000000001)\"><use xlink:href=\"#g3F0E579EADC51E233D83094E95B5AA39\" x=\"0\" y=\"0\" fill=\"#000000\" fill-rule=\"nonzero\"\/><\/g><g class=\"typst-text\" transform=\"matrix(1 0 0 -1 8.159555555555556 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Exercice 1 Attention \u00e0 ne pas confondre la quantit\u00e9 de mati\u00e8re et la densit\u00e9 particulaire, toutes deux not\u00e9es fr\u00e9quemment . Le mod\u00e8le propos\u00e9 ressemble au&hellip;<\/p>\n<p class=\"more-link-p\"><a class=\"more-link\" href=\"https:\/\/www.cpge-brizeux.fr\/wordpress\/psi\/physchim-psi-2526\/phenomenes-de-transport-3-diffusion-de-particules.html\">Read more &rarr;<\/a><\/p>\n","protected":false},"author":26,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[430],"tags":[],"class_list":["post-37597","post","type-post","status-publish","format-standard","hentry","category-physchim-psi-2526"],"_links":{"self":[{"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/posts\/37597","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/comments?post=37597"}],"version-history":[{"count":1,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/posts\/37597\/revisions"}],"predecessor-version":[{"id":37598,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/posts\/37597\/revisions\/37598"}],"wp:attachment":[{"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/media?parent=37597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/categories?post=37597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cpge-brizeux.fr\/wordpress\/wp-json\/wp\/v2\/tags?post=37597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}