The concentration of a gas in a chamber of Ney and Armistead type, as a function of time, has been calculated for two simple cases of concentration dependence of the diffusion coefficient viz., (i) D = D0(1 + αc), and (ii) D = D0[1 + αc/(1 + c)]. The correction due to the nonattainment of a quasi-stationary state has also been calculated.
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R. Paul (1960) studied this question.
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