Hi guys, let me tell you a story of Archimedes and King Hiero's crown... King Hiero loved his crown very much. He gave the goldsmith some pure gold to make a pure gold crown exactly like his old one. After the goldsmith finished, he gave the king. King Hiero put it on his head maybe a little to comfortably, so he suspected that the goldsmith cheated him and used some silver and kept some gold. He asked Archimedes to help him check whether the goldsmith is cheating. Archimedes took the gold crown home with him. He started to weigh them, he tried to get back to other problem, but he couldn't concentrate on it. He even forgot to bathe eat unless his slaves fed him. One day, his slaves brought him to the baths to bathe. When he went there, the bath attendant let to much water into the tub until it is almost overflowing. He stepped into the tub and some water flowed out. He immediately jump out of the tub, forgetting his clothes. He ran across the street, shouting Eureka!!! Eureka!!! in greek that means I found it... He ran home and take a clay bowl and filled it with water. He first put the goldsmith's crown into the bowl, some water, he did the same with the gold. The water that flowed out is different. The gold and crown should weigh the same, but they are different, silver is lighter than gold and more silver must be used to make it same so it took more space in the water and more water flowed out. While discovering a whole new field of experiments opened to his mind.
heavier=more dense
Gold is heavier than iron.
Iron is heavier than wood.
Water is heavier than air.
Gravity pulls hardest to densest things, for example rocks are denser than water, water is denser than wood, wood is denser than air.
So this is what I learned this week, and I will se you next time, bye...
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