Principle of the compressible fluid mechanics featured by ether non-viscosity and continuous medium

In the current optical theory, the moving mass of light quantum is usually studied as the basic mass where the photon energy is concerned. In the paper titled "The Relationship between light translation and fluctuation and ether energy and momentum", the relations between ether photon, energy of the ether field and its momentum can also be considered in light of the manifestation of the mass and momentum, This can show the situation of light quantum based on energy divergence, which has certain significance for an accurate understanding of ether. It can be seen that this method ignores systematicness and independent space of ether photon itself and only the overall relative manifested state of light quantum but not the essential state is revealed. In this context, it is difficult for us to understand the relationship between real photon mass and moving mass, which is quite unacceptable just like the principle of qualitative change in theory of relativity. From the perspective of quantum property of light quantum momentum, the relationship between the real mass of photon, moving mass and motion itself as well as the relationship between ether photon particle group and motion of astral body and hence the relationship with frequency are analyzed. Our discussion can accurately reflect the real conditions of mass, momentum and energy of light quantum. Many results conforming to the observation are obtained, which can provide explanations for the following relations: the relations between light radiation and motion of pulsating star, volume expansion and motion of astral body, nova eruption and motion, transverse Doppler effect, and the frequency difference in solar spherical radiation. The section can also be used as further development of the classical particle physics, and it can become the compressible fluid mechanics featured by failure of universal gravitation, no strength, non-viscosity and continuous media by changing the mechanics of a single mass point to the mechanics of mass point groups and the manifested group mechanics due to the energy expansion of the single mass point. By bypassing the too general concept of energy in theory of relativity, the energy is defined as the quantity of mass points and momentum points, so that the relationship between energy and momentum is analyzed more clearly.