According to Archimedes' principle, the buoyant force on a fully submerged object is equal to the weight of the water displaced by the object. This means that the buoyant force is directly proportional to the volume of the object submerged in the water.

Therefore, if an object is fully submerged in water, the buoyant force acting on it will be equal to the weight of the water that the object has displaced. This is a fundamental principle of buoyancy and has important applications in various fields, such as shipbuilding, submarine design, and fluid mechanics.