Ocean liners are huge vessels that can weigh thousands of tons. They are able to float on the water because of the principle of buoyancy. Buoyancy is the upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In the case of ocean liners, the fluid is water. The shape of the ocean liner is also important in determining its buoyancy. Ocean liners have a long, sleek shape that helps to distribute their weight evenly over the water. This helps to create a greater upward force of buoyancy, which allows the ship to float.