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Boussinesq approximation
(1) An approximation (Boussinesq 1903), to the exact equations of motion of water, which neglects, in the inertial term, variations in the density of water. (2) An approximation (Boussinesq 1903), to the exact equations of motion of a fluid, which assumes that the fluid is incompressible except insofar as thermal expansion produces buoyancy.
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