Two homogeneous balls, one of which is made of aluminum and the other of copper, are balanced on a beam balance.

Two homogeneous balls, one of which is made of aluminum and the other of copper, are balanced on a beam balance. Will the balance of the balance be upset if the balls are immersed in water?

The density of copper is almost three times that of aluminum. Since the scales are in equilibrium, the masses of the balls are the same. An aluminum ball will have almost three times the volume of a copper ball. On a body immersed in water, the force of Archimedes acts, which is defined as the weight of the water displaced by the body. Since the aluminum ball has a larger volume, the Archimedes force acting on it will be greater than the Archimedes force acting on the copper ball. The balance of the weights will be disturbed towards the copper ball.