阿基米德原理是从实验得出的,但是根据浮力产生的原因——物体受到液体向上和向下的压力差,也可把它推导出来.如图1,设边长为c的立方体,浸没在密度为ρ液的液体里.(1)立方体上表面受到液体向下的压强:p上=ρ液gh1;立方体上表面受到液体向下的压力:F上=p上l2(2)立方体下表面受到 Archimedes’s principle is derived from experiments, but according to the reason of buoyancy - the object is subjected to the pressure difference between the liquid up and down, it can also be derived. Figure 1, set the side of the cube c, Immersed in a liquid with a density of ρ liquid. (1) The upper surface of the cube is subjected to a downward pressure of liquid: p = ρ = liquid gh1; the upper surface of the cube is subjected to downward pressure of liquid: F = p = l2 (2) cube The lower surface is affected