Van der Waals Gas Pressure Problem

In general physics teaching of thermal to non-ideal gas equation of state-Van der Waals equation of learning and discussion,there will be some beginners often failing to figure out the problem,and it often occurs doubts and misunderstanding,The more prominent is the Van der Waals gas pressure problem.To this end,this paper proceeds its discussion from the Van der Waals gas micro-model proposed,the container wall near the Van der Waals gas pressure,the gas within the Van der Waals gas pressure,the gas within the pressure(ie gas due to intermolecular Mutual gravitational pressure changes caused by volume)and Van der Waals equation of several aspects of the physical meaning.So that beginners can properly understand.