Differences and relations between quantum mechanics and classical mechanics

Hello, quantum mechanics is a science that reflects the structure of microscopic particles and their laws of motion. Its appearance has brought great changes to physics. On the one hand, people have a better understanding of the movement of matter, on the other hand, people realize that physical theory is not absolute, but relative and has certain limitations. Classical mechanics describes the motion law of macroscopic material form, while quantum mechanics describes the motion law of microscopic material form. They are closely related and different in nature. There are many differences in concepts and principles between quantum mechanics and classical mechanics. This paper tries to find out the difference between them through comparison and contrast, so as to further understand the special laws of quantum mechanics and better understand and master the concepts and principles of quantum mechanics. (1) The research object of quantum mechanics is microscopic particles,

The research object of classical mechanics is macroscopic particles. Classical mechanics takes macroscopic objects in nature as the research object. Even if some objects are regarded as a particle for the convenience of solving problems, they still have size and mass, and the parameters describing their motion state are coordinates, speed, mass and energy. The research object of quantum mechanics is microscopic particles (molecules, atoms, nuclei and other basic particles). Its main task is to study the motion law of microscopic particles. However, we can't mistakenly think that quantum mechanics has nothing to do with the macro world. In fact, the laws of quantum mechanics not only dominate the micro world, but also dominate the macro world. In this sense, all physics is quantum physics, and classical theory is its approximation.