Why is the buoyancy correction equal to 1 in Figure 2-9 when the density of the object

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Buoyancy is the upward force exerted on an object in a liquid or gaseous fluid. An object weighted in the air appears lighter than its actual mass by an amount equal to the mass of air it displaces. True mass is the mass measured in a vacuum. A standard mass in a balance is also affected by buoyancy, so it weighs less in the air than in a vacuum. A buoyancy error occurs whenever the density of the object being weighed is not equal to the standard mass density. If there is a difference between the object’s density and the density of the weights used to calibrate the balance, then we can correct buoyancy.