在初中物理课我们讲到浮力时,为了便于学生理解,从规则物体出发阐明浮力是液体对物体上下表面的压力差,从而推导出阿基米德定律。我们知道这个压力差的产生完全是因为液体受到重力作用的缘故。而气体浮力的大小书上只说也遵循阿基米德定律,在初中也认为是气体受到重力产生了对其中物体上下表面的压力差.到了高中有些同学学 When we talk about buoyancy in junior high school physics class, in order to facilitate students’ understanding, it is clarified from the regular object that the buoyancy is the pressure difference between the liquid and the upper and lower surfaces of the object, and thus derive Archimedes’ law. We know that this pressure difference is entirely due to the liquid’s gravity. The book on gas buoyancy only says that Archimedes’s law is also followed. In junior high school, it is also considered that the gas is subjected to gravity and the pressure difference between the upper and lower surfaces of the object is reached.