Tracer Diffusion.-Thecomparison in this case is between the diffusion *It should be noted that a survey of the literature shows that there are two schools of thought with regard to the use of the term 'Self-diffusion'.One set of workers prefers to restrict the term to molecular motion in one-component systems, and this is the approach followed in this review.Others use it more generally to describe the thermal motion of a specified component in both single and multicomponent systems.
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Mills et al. (1976) studied this question.