Moment scaling at the sol-gel transition

Two standard models of sol-gel transition are revisited here from the point of view of their fluctuations in various moments of both the mass-distribu tion and the gel-mass. Bond-percolation model is an at-equilibrium system a nd undergoes a static second-order phase transition, while Monte-Carlo Smol uchowski model is an off-equilibrium one and shows a dynamical critical phe nomenon. We show that the macroscopic quantities can be splitted into the t hree classes with different scaling properties of their fluctuations, depen ding on whether they correspond to: (i) noncritical quantities, (ii) critic al quantities or to (iii) an order parameter. All these three scaling prope rties correspond to a single form: [M]P-delta(M) = Phi((M - [M])/[M](delta) ), with the values of delta respectively: = 1/2 (regime (i)), not equal 1/2 and 1 (regime (ii)), and = 1 (regime (iii)). These new scalings are very r obust and, in particular, they do not depend on the precise form of an Hami ltonian.