What the public spec covers
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Fluid properties (density, viscosity, surface tension)
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Fluid statics — pressure, manometers, forces on submerged surfaces
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Energy, impulse and momentum equations
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Pipe flow and friction losses
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Open-channel flow
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Pumps and turbines
WHERE PEOPLE LOSE POINTS
1Mixing gauge and absolute pressure in manometer and fluid-statics problems.
2Dropping the 2g in head-loss calculations — the distractors are built for it.
3Using pipe diameter where hydraulic radius belongs in open-channel flow.
Choose the fluid model before the formula
Reduce the stem to a physical cue, select the governing relationship, and verify the assumptions printed around the equation in the current FE Reference Handbook. This prevents a familiar formula from being applied to the wrong geometry or flow condition.
| Problem cue | Likely model | Check before calculating |
|---|---|---|
| Depth or manometer reading | Hydrostatic pressure | Gauge vs. absolute pressure; consistent fluid units |
| Changing area and velocity | Continuity | Use the correct area and confirm steady-flow assumptions |
| Pressure, elevation, velocity, pump, or turbine | Energy equation | Keep every term in head or energy units |
| Pipe length, diameter, roughness, and flow | Darcy-Weisbach | Darcy friction factor, Reynolds number, and minor losses |
| Channel depth, slope, and roughness | Open-channel relationship | Hydraulic radius, geometry, and uniform-flow assumptions |
Practice Fluid Mechanics now
One free worked example · independently authored for study
Fluid staticsEasy
A tank contains water to a depth of 4.0 m. The gauge pressure (kPa) at the bottom of the tank is most nearly:
A9.8 kPa
B19.6 kPa
C39.2 kPa
D101.3 kPa
Continue FE Civil practiceNot an NCEES question
Continue studying fluid mechanics
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Original practice
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Build a repeatable model, search, validate, and calculate sequence for every fluids problem.
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