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Published online by Cambridge University Press: 16 March 2023
This chapter introduces the mechanical property of a fluid when it is at rest. In the absence of shear force, fluid is balanced between pressure force and body force. A universal differential equation is derived to describe the pressure distribution in a static fluid. This equation, can be called hydrostatic equilibrium equation, is the key to solve any fluid static problems. Two typical situations are then discussed as applications of the hydrostatic equilibrium equation, one is static fluid under the action of gravity, the other is fluid under the action of inertial forces. Differences and similarities of fluids and solids in the transfer of force are discussed in the end. Atmospheric pressure at different heights is calculated in the “Expanded Knowledge” section.
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