笔者在教完《浮力》一章后,总结一个公式可以方便地解答漂浮体中的有关习题,即若物体 n/N 的体积浸没于某液体中,则物体的密度就是液体密度的 n/N,反之,如果漂浮体的密度是液体密度的 n/N,则该物体漂浮在该液体中时就有 n/N 的体积浸在液体中,现证明如下: After teaching the chapter “buoyancy”, the author summarizes a formula that can easily solve the problems in the floating body. That is, if the volume of the object n/N is submerged in a liquid, the density of the object is n/N of the liquid density. On the contrary, if the density of the floating body is n/N of the liquid density, then the object floats in the liquid and there is n/N volume immersed in the liquid. Now it is proved as follows: