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利用U型管使被浸没的物体只受到重力和浮力作用,同时,根据阿基米德原理,浸没在液体中的物体受到浮力的大小等于它排开的液体所受到的重力,用公式表示F_浮=G_(排水)=ρ_水V_(排水)g,可知物体受到浮力的大小与物体排水的体积成正比,通过改变气球的体积即改变排水体积来改变物体受到的浮力,使F_浮=G_物,则物体处于悬浮状态。
U-shaped tube so that the object is immersed only by gravity and buoyancy, while, according to the principle of Archimedes immersed objects in the liquid buoyancy is equal to the size of the liquid it is gravity, by the formula F _ Float = G_ (drainage) = ρ_ water V_ (drainage) g, we can see the size of objects subject to buoyancy is proportional to the volume of the object drainage, by changing the volume of the balloon that is to change the volume of displacement to change the object by the buoyancy, F_ Float = G_ object, the object is in suspension.