在初中物理“浮力”一章中,有一类问题专门研究经过某一与浮力有关的物理过程后判断液面是升是降,还是不变.对此类问题,学生理解起来很困难,解答时经常出错.但是利用填充法解答,则会既准确又快捷,能达到事半功倍的效果.所谓填充法,就是首先设想把物体从液体中取出来,得出物体所占液体空间的体积(其实就是 V_排);然而求出物体发生某一物理变化过程后,具有填充作用的总体积 V_总;再比较 V_排 In the junior high school physics“buoyancy” chapter, there is a class of problems that specifically examines whether a liquid surface rises or falls, or remains unchanged, after a certain buoyancy-related physical process. For such problems, students understand it very difficult. Answer often mistakes. But using the filling method to answer, it will be both accurate and fast, can achieve a multiplier effect. The so-called filling method is to first imagine the object out of the liquid to get the volume of the liquid space occupied by the object (in fact, Is the V_row); however, after the physical change of the object has been calculated, the total volume V_total with the filling effect; then compare V_ row