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The Navier-Stokes equations express:

AConservation of mass only
BConservation of MOMENTUM for a Newtonian viscous fluid
CConservation of energy
DConservation of species
Answer & Solution
Correct answer: B. Conservation of MOMENTUM for a Newtonian viscous fluid
N-S is the momentum equation for a Newtonian (linear stress-strain-rate) fluid. **Force-per-volume balance:** time rate of momentum change + advection = pressure gradient + viscous stress + body force.
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Related questions
Conservation of THERMAL ENERGY in a flowing fluid involves which key terms?For an INCOMPRESSIBLE Newtonian fluid with constant μ, the Navier-Stokes equation reduces The CONSERVATION OF MASS equation for an incompressible fluid ($\rho$ = const) is: