  It is shown that the Fisher Droplet Model (FDM), percolation and nuclear
multifragmentation share the common features of reducibility (stochasticity in
multiplicity distributions) and thermal scaling (one-fragment production
probabilities are Boltzmann factors). Barriers obtained, for cluster production
on percolation lattices, from the Boltzmann factors show a power-law dependence
on cluster size with an exponent of 0.42 +- 0.02. The EOS Au multifragmentation
data yield barriers with a power-law exponent of 0.68 +- 0.03. Values of the
surface energy coefficient of a low density nuclear system are also extracted.
