(2) The difference in the weight of the object out of the fluid and the weight of the object while immersed in the fluid is equal to the weight of the fluid displaced, ? g , where ? is the mass of the fluid displaced. If the fluid has a density, p. = Vf "I, we can substitute ? f = p Kinto equation (2) and obtain ?g - ? g = Pf fg (3) However since lume the fluid displaced I is equal to the volume f the submerged object we can also