Hydraulics & Fluid Mechanics
The line of action of the buoyant force acts through the

center of the volume of floating body
centriod of the displaced volume of fluid
centroid of the volume of fluid vertically above the body
center of gravity of any submerged body

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Hydraulics & Fluid Mechanics
The normal stress is same in all directions at a point in a fluid

When there is no motion of one fluid layer relative to an adjacent layer
only when the fluid is frictionless
irrespective of the motion of one fluid layer relative to an adjacent layer
only when the fluid is incompressible and has zero viscosity

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