Why do not the ships sink?
According to historical information, shipbuildingappeared even in the times of Ancient Egypt and Ancient China. Even then, ships were used to transport goods and for military purposes. Also in history it is mentioned that the ships of the Eastern Slavs consisted of a skeleton that was covered with leather.
Modern ships are made of metal. Their walls are very thick and impenetrable. Nevertheless, it is surprising why iron ships do not sink and are afloat, because they are so huge and heavy. After all, if, for example, throw a small metal ball into the water, then it instantly drowns. What's the secret?
It's all in the air
The fact is that the ship, apart from the high sides,has a stock of air inside its body (after all, it is hollow). And as you know, air has a lower density than water. Here is an explanation of why ships do not sink. It is possible to sink a vessel if the load-carrying capacity established during design and assembly is not observed. Also, if a hole is formed, the water that enters the housing displaces the air, and the ship immediately goes to the bottom.
The Power of Archimedes
In this case, the explanation why the ship does notdrowning, a little different. Here the law of force of Archimedes operates, according to which water pushes the bodies immersed in it with a force equal to the weight of the fluid that has been displaced by this body. Accordingly, the larger the volume of the ship, the more it pushes out the water.
The ships are designed in such a way that duringimmersion, they displaced a large volume of water. The weight of this quantity of water should be equal to the weight of the vessel when it is in a loaded condition. This phenomenon is called the displacement of the ship.