An object immersed in a fluid displaces an equal amount of fluid. The fraction of the object submerged in the fluid depends on the magnitude of buoyant force acting on it. From Archimedes' principle, the buoyant force acting on the object is directly related to the fluid density. If a higher density fluid replaces the lower one, the displaced fluid volume measures a higher weight, thus increasing the buoyant force acting on the object. For a floating object, the submerged fraction is the ratio of volume immersed inside the fluid to the object's volume. The submerged volume equals the volume of the displaced fluid. Using the relationship between the volume and mass and equating the object's mass to the displaced fluid's mass, the submerged fraction is obtained as the ratio of the object's density to the fluid's density. Higher the fluid density, lower is the submerged fraction, pushing the object higher up in the fluid.