Why do steel ship floats over water?
While a solid piece of steel would sink, a steel ship is not solid steel. Fill your sink with water. Put an empty bowl on top of the water. It will float. It’s called displacement. Now, fill the bowl with water. It will sink. The material the bowl is made from is heavier than water. The entire bowl is not made from the heavy material, only the outside of the bowl. Likewise, Only the sides of the ship are made from steel. The inside consists of air just like your bowl did when it floated on the water. If the inside of the boat fills with water, it will sink.