The buoyant force is the upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. The magnitude of the buoyant force is equal to the weight of the fluid displaced by the object. In this case, the ball bearing will displace an amount of glycerine oil that is equal to the volume of the ball bearing. The weight of the displaced glycerine oil will be greater than the weight of the ball bearing, so the ball bearing will float.
The density of an object is defined as the mass of the object per unit volume. The density of glycerine oil is approximately 1260 kg/m^3, while the density of a ball bearing is approximately 7850 kg/m^3. Therefore, the density of the ball bearing is less than the density of glycerine oil, and the ball bearing will float on the surface of the oil.
