等压法的具体内容:柱形容器中的物体,在容器中发生物理变化前后由于物体的质量守恒,重力大小不变,所以对容器底造成的压力前后相等.例1 如图1所示,装有铁块的烧杯,漂浮在柱形容器中的水面上,当将烧杯中的铁块取出并投入水中后,水面高度如何变化? The specific content of the isobaric method: Before and after physical changes occur in the container, the mass of the object is conserved before and after the physical change in the container, and the gravity is constant, so the pressure caused by the bottom of the container is equal. Example 1 As shown in Figure 1, A beaker containing iron pieces floats on the surface of the water in a cylindrical container. When the iron in the beaker is removed and thrown into the water, how does the surface height change?