  We show that black holes fulfill the scaling laws arising in critical
transitions. In particular, we find that in the transition from negative to
positive values the heat capacities $C_{JQ}$, $C_{\Omega Q}$ and $C_{J\Phi}$
give rise to critical exponents satisfying the scaling laws. The three
transitions have the same critical exponents as predicted by the universality
Hypothesis. We also briefly discuss the implications of this result with
regards to the connections among gravitation, quantum mechanics and statistical
physics.
