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In this work we focused on the kinetics of a one-dimensional Ising system(1DIS) with constant nearest-neighbor interaction (NNI). The exact solution ofboth thermodynamics and kinetics of this system under quasi-chemicalapproximation (QCA) had been shown in the literature, and the equilibriumsolution was exact. In this work, it was discussed why QCA applied the best inthe case of 1DIS with constant NNI. Furthermore, extension had been made todiscuss that due to this special reason, perhaps the kinetics of the systemunder QCA is the correct steady-state kinetics. Inspired by this observation,the activity and activity coefficients of the system was studied closely tore-examine the form of the equation of motion under QCA. A novel concept---theinstantaneous activities and the corresponding instantaneous activitycoefficients---was introduced, and in terms of these quantities the kineticsseemed to be much simpler and physically more meaningful. The chevron plot ofthis system was also discussed and new way of looking at the \emph{rollover} ofchevron plots was presented.

Activity and Steady-State Kinetics of One-Dimensional Kinetic Ising Model