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This all depends on buoyancy of the liquid the boat is in, and the density (therefore the mass and volume) of the concrete boat.

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Why does concrete float?

Concrete does not float naturally in water; it is denser than water. However, when concrete objects such as boats or platforms float on water, it is typically due to buoyancy provided by a hollow structure or trapped air pockets within the concrete. This buoyant force can make the overall concrete object less dense than water, causing it to float.


Will concrete sink in water?

If the weight of the object is greater than that of an equal volume of water, it'll sink. People build boats out of concrete - it's a common assignment in civil engineering classes. If the boat will displace 1000 gallons of water but it weighs less than 8000 pounds...it'll float.


What force allows boats to float?

Buoyancy is the force that allows boats to float. When a boat displaces water, it experiences an upward force equal to the weight of the water it displaces, keeping it afloat.


What is a wooden float called?

A wooden float used in construction and masonry work is typically called a "wood float" or "hand float." It is used to smooth and level wet concrete surfaces.


Why do boats float and ships sink?

Boats float and ships sink based on their design and displacement of water. Boats are typically smaller and made with materials that displace enough water to keep them afloat. Ships, on the other hand, are larger and heavier, requiring a greater displacement of water to remain buoyant. If a ship takes on too much water or has a design flaw that affects its buoyancy, it may sink.