Viscous stress in a fluid arises when adjacent layers of fluid move at different velocities, causing a transfer of momentum at the molecular level. This generates shear stress and non-zero velocity gradients both parallel and perpendicular to boundaries. Such stresses are primarily due to:

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Physics · Fluid Mechanics

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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shear caused by momentum transfer between fluid layers

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Answer 1

gravitational forces acting on the fluid, producing pressure differences

Answer 2

elastic deformation of fluid molecules resisting compression

Answer 3

shear caused by momentum transfer between fluid layers

Answer 4

convective acceleration in turbulent flow without molecular interactions

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