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一切浸入液体里的物体，都要受到流体对它竖直向上的浮力；浮力的大小只与物体排开液体的体积和液体的密度有关，即只与V和ρ有关，与其它一切因素无关。初中学生往往对这一知识点难以理解，而对这一知识点的理解和掌握，又关系到对阿基米德原理的理解，关系到对浮力本质的认识
All objects immersed in liquids are subject to a vertical buoyancy of the fluid; the size of the buoyancy is only related to the volume of the liquid and the density of the liquid, that is to say only V and ρ, and has nothing to do with all other factors. Junior high school students often find it difficult to understand this point of knowledge. Understanding and mastering this knowledge point also relates to the understanding of the Archimedean principle and to the understanding of the nature of buoyancy.