“Fick’s second law”的概念、定义、翻译、参考文献-科学参考

单词	Fick’s second law
释义	Fick’s second law Chemical Engineering A law that predicts how diffusion causes the concentration of a diffusing species to change with time and given by: $\frac{\partial ϕ}{\partial t} = D \frac{\partial^{2} ϕ}{\partial x^{2}}$ where ϕ is the concentration per volume, and x is the position. The law can be derived from Fick’s first law of diffusion and a mass balance of the diffusing species by assuming that the diffusion coefficient, D, is constant.
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