Answer
See explanation.
Work Step by Step
Gold is denser than all common metals, meaning it takes up less volume for its weight. When submerged in water, a pure gold brick of a certain weight will “lose” less weight than any brick made of baser metals, because it will displace the least water, and experience the smallest buoyant force.
You could not make a fake gold brick unless you embedded a material with higher density, such as plutonium, platinum, or osmium.
