1. The problem statement, all variables and given/known data A two dimensional crystal process is modelled by an Avrami equation phi(t)= 1-exp(-k*t^2), where k>0. Experimental observation suggests that the inflection point of phi occurs at t=2 hours. Find the dimension and numerical value of k. 2. Relevant equations I know how to take the log-log of this equation in order to linearize it. 3. The attempt at a solution I tried to have a system of two equations with 2 unknowns, but failed because I don't know the value of phi at any time t. Any help would be greatly appreciated.