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⚓ How does a ship float

See how gravity, buoyancy, displacement, hull shape, loading, and stability work together to keep a ship afloat.

3
lessons
~10 min
to learn
Adults
level
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What you’ll learn

  1. The upward pushExplain buoyancy and displacement as the balance between a ship's weight and the weight of water it pushes aside.Water pressure creates an upward force, and a ship settles at the draft where buoyancy matches total weight.
  2. Shape and loadConnect hollow hull shape, density, water type, cargo, and load lines to a ship's waterline.Hull volume and loading determine how much water a vessel must displace and how much freeboard remains.
  3. Staying uprightDistinguish flotation from stability and describe how ballast and watertight compartments protect a vessel.A ship must not only float but also resist heeling and preserve buoyant volume after damage.

Questions this course answers

What does a floating ship's displacement represent?

A floating ship displaces a weight of water equal to the total weight of the vessel and its contents.

Why can a steel ship float while a solid steel block sinks?

The ship includes large air-filled spaces, so its average density and hull volume allow it to displace enough water.

What usually happens when cargo is added within safe limits?

Extra weight makes the vessel settle deeper until the larger displaced volume produces matching buoyancy.

What is the difference between flotation and stability?

A vessel can have enough buoyant force yet still be unstable if its weight distribution and hull response allow it to capsize.

Why do ships use watertight compartments?

Bulkheads and doors can limit the spread of water so the remaining hull retains enough flotation and stability.

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