Buoyant Force

KEY CONCEPT 

Buoyant Force

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When an object is placed in a fluid, the fluid exerts an upward force, we call the buoyant force. The buoyant force comes from the pressure exerted on the object by the fluid. Because the pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on the top - hence the net upward force.
The buoyant force is present whether the object floats or sinks.   
Fluids - Quiz
Buoyancy and Density

Critical thinking Explain why water as ice is not a fluid but water as a liquid or steam is a fluid.