UNDERSTANDING HOW SHIPS FLOAT

We cant walk on water, we're too heavy and we'll sink like stone. Imagine a nail will sink on a water, but aircraft carrier can float, eventhough its almost 300 meter long, and carries almost 70 airplanes and 4000 crews onboard. A container vessel having atleast 180000 gross tonnage excluding different cargoes onboard are brilliant examples of how science can be put to work.
How do ships exactly do their stuffs.?If you drop a nail into a cup of water it sinks, right? The nail sinks because the density of the steel is greater than the density of the water.

But ocean vessels, are thousands of times heavier than a nail, are made of steel so why do they float? We learn in school about gravity, as defined it is a pull of an object. But there is also an opposing force on that, bouyancy. The push to gravity’s pull, its the force that floats the boat. Any object will either float or sink in water depending on its density (how much a certain volume of it weighs). If it's more dense than water, it will usually sink.
When an object enters water, two forces act upon it. There's a downward force (gravity) that's determined by the object's weight. There's also an upward force (bouyancy) that's determined by the weight of the water displaced by the object.
An object will float if the gravitational force is less than the bouyancy force. So, in other words, an object will float if it weighs less than the amount of water it displaces.