Hydraulics & Fluid Mechanics
Fluid is a substance that

cannot be subjected to shear forces
always expands until it fills any container
cannot remain at rest under action of any shear force
has the same shear stress.at a point regardless of its motion

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Hydraulics & Fluid Mechanics
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is

inversely proportional to Reynolds number and directly proportional to pipe wall roughness
directly proportional to Reynolds number and independent of pipe wall roughness
inversely proportional to Reynolds number and indpendent of pipe wall roughness
directly proportional to pipe wall roughness and independent of Reynolds number

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