Скачать или смотреть জাহাজ পানিতে ভাসে কেন। Why does the ship float in the water.

The 'Eureka' moment of the Greek philosopher Archimedes - the naked Archimedes burst through the mystery of the king's golden crown shaft and shouted Eureka, is an immortal story. About 246 BC. The authenticity of the story is doubted, but Archimedes discovered his formula at the time. Relying on his formula, people have boarded the ship fearlessly, discovered how many new countries and continents! Isn't it surprising?
There is a 'but' here though. A big 'but'. How a ship floats can be explained through Archimedes' formula. However, shipbuilding did not begin through this. Even before the discovery of oxygen, people used to breathe, so even before the discovery of this formula, people floated ships, boats or rafts on water. Although they may not know exactly why or how it works.
If you look at history, you can see that the first giant ship was found in ancient Egypt. It is about 6 thousand BC. There is also evidence that people floated rafts about 2,000 years ago. The oldest raft in history, not Egypt or Greece, was found in what is now the Netherlands. This raft, found in the country's 'Pese' village in the Darrens province, is named 'Pese canoe' or 'Pese raft'.
Anyway, let's get back to the original question. What does Archimedes' formula actually say? How does a ship float? To understand, let's think of a scenario that we can test at home.
A bucket full to the brim. What happens if you bring a heavy empty box and float it? Some water will overflow. The box has weight. It takes up that space by displacing its own weight of water. Then? But the box will not sink, it will float. Why? Because the water is pushing it upwards. If the water had not pushed the box upwards, the box would have sunk. It reached the bottom of the bucket. This is the water pushing the box upwards, exerting an upward force on it, causing the box to float. In English this whole phenomenon is called Buency.

Flood is called in Bengali. And the water pushing the box upwards is called Buoyant Force.
What is actually happening here? The box is empty. ie airy. The density of the box per unit volume is less than the density of water. In short, the box is lighter than water. That's why it floats.
But the ship is not light! Weight ton to ton. So? It must be remembered, besides being heavy, ships are very large in size. Enough space is kept inside its shell. Everything is filled with air. It sits above the water over a large area in terms of size. By the amount of space it occupies above water, its density per unit volume is less than that of water. That is why the ship can float.
So, why does the shipwreck happen?
Accidentally, somehow the shell of the ship burst open and water got inside. Then the density inside the vessel (the water occupying the space of the air) and the density of the water outside become equal. As the density difference decreases, the ship sinks. Water gradually occupies the air space inside the ship. Now that there are shells and goods, there is no more air in them. They are no longer lighter than water, but heavier. So they sink.