The induction times at supersaturation of 1.15 -1.24 and the metastable zone widths with cooling rates of 6.0 -30.0 K/h have been determined in the system of dicyandiamide and water. A model based on accumulation of nucleation potential, derived from the classical nucleation theory, has been appliedto estimate the critical nucleation potential and pre-exponential factor for both experimental results of induction times and metastable zone widths. The estimation values were fairly agreed with the experimental values. The preexponential factor was assumed to be constant in the model, while the modifications of pre-exponential factor, dependent on the supersaturation, has been introduced to the model, for a more consistent estimations between the induction time and metastable zone width.

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