What is the explanation of Archimedes principle ?
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Explanation of Archimedes Principle
The Greek mathematician and famous physicist Archimedes discovered that when an object is immersed in a liquid or gas, the object appears to lose some weight. For example, if you cannot lift a tree stump when it is on the ground, you can easily lift it when it is submerged in water. That is, it will seem lighter to you or the object will seem to have lost weight. Archimedes explained this lost weight. He discovered that the weight lost by an object when immersed in water is equal to the weight of liquid or gaseous matter displaced by the object. This is called Archimedes’ principle.
This simple explanation is that if you submerge a wooden block weighing 100 kg and having a volume of 40 liters in water, the wooden block will occupy an area equal to that of 40 liters of water or displace 40 liters of water if fully submerged. Since the object is displacing 40 liters of water, the object will also lose 40 kg of weight by submerging in water. That is, as a result of immersion in water, the weight of the object will decrease from 100 kg to 40 kg to 60 kg.
You will surely understand now, you can even wash this wooden doll weighing 100 kg in water if you want. If you make a wooden box out of that 100 kg wooden block, the volume of the box will increase even if it weighs 100 kg due to leaving a lot of empty space inside the box. Assume that you have made the volume of the box 120 liters by leaving empty space inside. Now by immersing this box in water, it will displace 120 liters of water.
But the weight of the box was 100 kg, there is no chance to lose an extra 20 kg weight. So the box will not completely submerge in water. Ships or boats are basically made from this explanation. Ships or boats weigh much less than the amount of water they displace.