Chapter 4: cleaner structure, integrates better with main plan
* Calculation of forces on wall come first. They are actually the most useful equations in the chapter * The derivation of the "grad p = rho g" equation is now done in 3D, in line with the other chapters. I never completely understood the method I used to use (taken from classic textbooks) and suspect it just is worth nothing Part of the new derivation is taken back from chapter 6. * Static fluids are now clearly presented as a special case. This is now also reflected in the problem sheet.
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