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References in periodicals archive ?
(iii) Interaction forces such as shear lift force, drag force, and pressure gradient force exist between the liquid and solid phase.
In the weather prediction game, this is called the pressure gradient force, and it's a biggie in weather creation.
The reduction in pressure in the constriction can be understood by conservation of energy: the fluid (or gas) gains kinetic energy as it enters the constriction, and that energy is supplied by a pressure gradient force from behind.