一种简易浮力演示器的制作

The Principle and Making of Simple Demonstrator for Buoyancy

浮力产生的原因是物体下、上表面存在压力差 ,当物体下表面未与液体接触时 ,液体对物体下表面没有压力 ,因而物体不受浮力作用 ,教材中对此只是用图说明而没有相应的实验演示 ,导致很多学生对这一点理解得不透彻 ,存在模糊认识 .为此 ,设计一个简易的演示装置 。

Buoyancy is originated from the pressure difference between the upper surface and the lower surface on object in the liquid. There is no pressure of the liquid on the lower surface of the object when it is not contacted to the liquid. In this situation, there is no buoyancy on the object. In many teaching courses, some figures are given but any experimental demonstrating is not shown. Therefore a number of students can't understand clearly it. In this paper, a simple and concise demonstrating apparatus is designed to expound the cause of buoyancy.