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Archimedes was a Greek scientist. He lives in Syracuse nearly 200 years ago. The King of the land wanted to wear a Golden Crown. He gave some gold to a goldsmith to make a suitable crown. After few days, the goldsmith brought the finished crown to the King. The King wanted to find out the truth. He asked his court scientist Archimedes to find out.
Archimedes thought about the problem day and night. One day he was about to have his bath, but he was busy thinking. He did not notice the bathtub. The water in the bathtub was already full to the brim. He slid into the bathtub. Immediately a large quantity of water flowed over the brim of the bath tub. He noticed this suddenly. His brain wave worked suddenly.
"Different metals of the same weight have different volumes. Objects, put in water, will displace water. The displaced water will be equal to their volume." Archimedes said.
Archimedes took two bowls. He filled them with water to the brim. He placed the crown in one bowl. Water overflowed. It collected at the bottom of the other bowl. Then he took a block of pure gold. He places this gold cube in the middle of the second bowl. Here also water overflowed. Water was collected at the bottom of the another bowl.
Archimedes then measured the quantity of water in the two bowls. He found out the difference in the water overflow. The crown had let out more water. The cube of gold had let out less water. But both the crown and the gold cube were of the same weight. Therefore, the crown had some other metals mixed in it. These metals took up more space in the water than pure gold.
Archimedes reported this finding to the King. The King demanded the truth from the goldsmith.
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