More Problems in Fluid Statics

For simple fluids at rest, the pressure-depth relationship is given by the basic equation of fluid statics dPIdz -pg. This equation is found by considering the weight of a small element of fluid and the pressure change with depth necessary to support that weight. 

For changes in elevation measured in thousands of feet, gases cannot be treated as constant-density fluids. For isothermal, isentropic, or constant-temperature-gradient behavior, the basic equation can be integrated easily. 

In problems involving liquids with free surfaces, it is generally easiest to work in gauge pressure, in which case the basic equation simplifies further to Fg, g, = pgh. 

Problems involving accelerated motion can be handled by the methods of fluid statics if the particles of fluid do not move relative to each other. 

See the Common Units and Values for Problems and cover of the book. 

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