Abstract
The interactional force between two vibrating Spheres in the medium which has the density of matter corresponding to the radiation energy is analized. The equation of wave motion and the velocity potential are introduced. Then the pressure of wave motion is obtained. The resultant force of the pressure exerted on the surface of one vibrating sphere by the other same sphere can be derived, which is proportional to the density and square of volume vibrating velocity and inverse-proportional to square of distance between both spheres. Comparing the force with the electrostatic force, the quantity of electricity can be defined.
