In this paper, an experiment results verifying Al-Amr principle(v.r=C) is presented, the constant C is determined , by following a method similar to Millikan's in his experiment for determining Planck's constant . In this experiment, general relativity is tested, and the critical curvature of space-time (or the maximal universal acceleration) is obtained.

Keywords : Quantum Gravity , Maximal Universal Acceleration , Al-Amr Constant ,Experiment.