Lista Difusão dos Sólidos

lista de difus\u00e3o dos s\u00f3lidos\nAlicia Turrina\nmatr\u00edcula 669738\n1)\nD = k c / R T\nln (c / co) = -Qa / RT\nln (6.45.10^{-}7) = -73000\n-1.98.7 A\n-141,25 - 36.738,6\nT = 36.38,0 = 2577,15 K =\n141,25 = 830,41\u00b0C\n\n2)\nD = 6.10^{-}11 m2\nJ = 1,2 . 10^{-}7 kg m^{-}2\nCa = 4 kg/m3\nLa = 1,5 mm; 1,5 . 10^{-3}\nT = 1200\u00b0C\nCb = 2 kg\nJ = -Dca - Cb\nJ = -Dca - Cb\n1,5.10^{-3} x b = 15.10^{-3}\n1,5 . 10^{-3} x b = 2\n1,2.10^{-7}\n\n-xb: 16,7.10^{6}, 1,5.10^{-3}\nXb: 16,7.10^{6}, 1,5.10^{-3}\nXb = 16,7.10^{6} - 3,5.10^{-3} 3)\nXa = 5 mm\nCa = 1,579 g/m3\nA = 0,2 m2\nD = 1.10^{8}\nJ = M = \u2206c \n=A.\u2206x 0,12.t\n= 1,0.10^{-8}\n= 1,5 . 0,3 / 5.10^{-7}\n\nm = 480.10^{-4}\n\n4)\nXa = 1mm\nT = 72,5\u00b0C\nJ = 1,41.10^{-6}kg m^{-}2\nD = .\n\nJ = -0,1012 - 0,0075\n\u2206c = 1 . 10^{-8}\n\n1,4.10^{-8} = D.0,0045\n1.10^{-3}\nD = 1,4.10^{-8} . 1.10^{-3}/0,6045\n= 3,11.10^{-9} m^{2} /s