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The main idea at work is the upward force of fluid that opposes the gravitational pull on an immersed object, buoyancy. Water pushes the ship upwards.

In Earth, fluid experience greater pressure the further we go down. This is why we cannot simply go to the bottom of the ocean with a wooden barrel-it will be crushed by the pressure exerted by the water if it will go deep at all. This pressure forces things to go up. And, this force is directly proportional to the weight of the water. This means that things denser than the water will go down. Ships today are made of metal which are denser than the water however, the ship is not composed of only metal. Ships also contain air which is less dense than water. Ships contain more air than metal to decrease its density and become less dense than water to float on it.

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11y ago

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