"Eureka" comes from the Ancient Greek and means: "I have found it"; it has become a very famous expression thanks to the Greek mathematician, physicist, engineer, inventor, astronomer and inventor Archimedes.
This is the story: a King had a ordered to make a golden crown. When the crown was ready the King wasn’t sure the goldsmith had used only the gold. The crown did weight exact as the amount of gold that was given but the King was afraid that the gold was mixed with other much cheaper metal and then the goldsmith could keep the not used gold. So he ordered Archimedes to find out whether it was pure gold or not. Of course Archimedes could not cut the crown to see what was inside. How could he do it? He was thinking about it and thinking goes very well when you lay in a bad... and when the bad is full of water and you go into it...a lot of water will flow over the edge. And suddenly Archimedes knew how he could solve the problem EUREKA! We know that a kilo lead is much smaller than a kilo aluminium, so when you put lead in a bad with water there will flow less water over the edge as when you put a kilo aluminium in it.
So he filled a rain barrel full with water and took exact the same amount of gold as the crown weighed and let it carefully
sink in the barrel. He also filled another rain barrel with water and in that one he let the crown sink. Now he could see that if the crown was made of pure gold the water level would be exact the same when they had taken the gold and the crown out of the barrels. And when the crown wasn’t pure gold...the level would be different.
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