The Material Connection between Classical Mechanics and Relativity

In the past, the relationship between classical mechanics and relativity focused on the quantitative aspect, and it was considered that relativity described the precise quantitative relationship of things, while classical mechanics was only an approximation in the case of low speed and weak gravitational field. This paper points out that there is a special material connection between classical mechanics and relativity, where the special substance is the physical vacuum, which is everywhere, and people are always looking at the world through the physical vacuum. In the case of low speed and weak gravitational field, the density fluctuation of physical vacuum is small, and the classical mechanics without considering the effect of physical vacuum can be established; in the case of high speed and strong gravitational field, the density fluctuation of physical vacuum is large, and the relativistic effect appears, which can be seen as a “lens effect” caused by changes in the density of the physical vacuum. The so-called relativistic factor is actually the compressible factor of ether density changing with velocity. Understanding this material connection will reveal the limitations of relativity and provide new ideas for the further development of physics.