学了克拉珀龙方程后,变质量问题是不太难解的。但中学生不必学较繁难的克拉珀龙方程,现在必修本已不再介绍此方程。但是打气、漏气、气体混合等基本现象都涉及质量增减,这类问题学生常不会解或感到难解。因此有必要寻求不用克拉珀龙方程解变质量问题的简便规律。 After learning Clapperon’s equation, the problem of variable quality is not very difficult to understand. However, middle school students do not have to learn more complicated Craporne equations, which are no longer introduced in the compulsory books. However, basic phenomena such as pumping, air leakage, and gas mixing all involve quality increase and decrease. Students of this type often do not understand or feel puzzled. Therefore, it is necessary to seek a simple rule of solving the variable quality problem without Clapper equation.