How archimedes principle is used to determine the purity of gold?

Archimedes used the principle of buyoancy to find the purity of gold. According to which a body immersed in a fluid experiences a buyoant force equal to the weight of the fluid it displaces.With the help of this principle, the density of the golden crown and the density of solid gold was compared by balancing the crown on a scale with a reference piece, this set up is then immersed in water. If the crown is less dense than gold, it will displace more water, and thereby will experience a greater buoyant force than the reference piece.

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