If the body floats in a liquid, then the weight of the displaced liquid is ..

To find the weight of the displaced fluid, you need to know Archimedes’ law. He says that a buoyant force acts on a body immersed in a liquid, equal to the weight of the liquid in the volume of the submerged part of the body. The force is called the Archimedes force: F = pgV, where p is the density of the fluid, g is the acceleration of gravity, V is the volume of the submerged part of the body. As mentioned earlier, this force is equal to the weight of the displaced fluid. (Weight, like force, is expressed in Newtons.)