where m nuc i denotes the mass of ice formed immediately after the nucleation event, that led to the instantaneous depletion of the existing supercooling, and the corresponding equilibrium temperature T eq (t nuc ). With the supercooling depleted, no further primary nucleation event may take place after t nuc ; the first primary nucleus thus remains the sole one. Crystal growth, on the other hand, is governed by heat transfer with the exterior, whereby