自擴散
Self-diffusion describes the diffusive motions of molecules within themselves e.g. the movement of a water molecule in water. According to the IUPAC definition, the self-diffusion coefficient D_i^* of medium i is the diffusion coefficient D_i of a chemical species in said medium when the concentration of this species is extrapolated to zero concentration. It can be described by the equation:
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依照IUPAC定義，自擴散（self-diffusion）係數是指化学势梯度為零時，物質的擴散係數。自擴散係數和擴散係數的關係如下： 其中為物質的活性度，為物質的濃度。自擴散係數一般會假設和觀測待確認物質同位素運動所得的示踪物擴散係數相同。
Abstract from DBpedia / Wikipedia · CC BY-SA