I stick metal foil on an a 1 square meter large and 10 kilograms heavy dielectric so that a condenser is build. By putting a tension of 10 kV on the condenser or by short-circuiting it I measure a real reduction of the weight of about 0.1 grams each time. This result confirms my theoretical conclusion which says that the weight of a body is related with the movements of its charges (protons and electrons). Keywords: Gravitation, movement of electrical charges, relativity