| Symbols Used | SI units | |
| A, δA | Surface area | m2 |
| B | Body force | N |
| a | Acoustic velocity | m/s |
| f | Friction coefficient | |
| F | Force | N |
| Fr | Froude number =  |
|
| g | Earth's gravity | m/s2 |
| h, H | Head, distance | m |
| I | Second moment of area | m4 |
| k | Source/sink strength | m2/s |
| L | Characteristic length | m |
| m, δm | mass | kg |
| M | Mach number = U/a | |
| N | RPM | rad/s |
| p | Pressure | N/m2 |
| r, R | radial distance | m |
| Re | Reynolds number = UL/n | |
| t | Time | s |
| T | Torque | Nm |
| u, v, w | Velocity components | m/s |
| U | Flow velocity | m/s |
| V, δV | Volume of control volume | m3 |
| w, g | Specific weight | N/m3 |
| x-, y-, z- | Cartesian coordinates | |
| Greek letters | ||
| ω | Angular velocity, ... |
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