Archimedes was possibly the world's greatest scientist — at least the greatest in the classical age, perhaps his best-known achievement was his "Eureka" moment, when he discovered the principle of buoyancy. Archimedes was charged with proving that a new crown made for Hieron, was not pure gold as the goldsmith had claimed. Archimedes thought long and hard but could not find a method for proving that the crown was not solid gold. Soon after, he filled a bathtub and noticed that water spilled over the edge as he got in and he realized that the water displaced by his body was equal to the weight of his body. Knowing that gold was heavier than other metals the crown maker could have substituted in, Archimedes had his method to determine that the crown was not pure gold. Forgetting that he was undressed, he went running naked down the streets from his home to the king shouting "Eureka!". And thereby he stated the principle of buoyancy that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid that is displaced by that object. In other word’s spilled water is directly proportional to the weight of the submerged object.

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