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In fluid mechanics, it is very easy to make a sign error (e.g., forgetting to convert pressure head or mismatching units of meters to kilopascals). The solution manual provides a cross-check. Students need to see where they dropped a negative sign or misapplied the continuity equation. When searching for and using resources like solution
To give you a taste, here are two classic problem types whose solutions are detailed in the manual: When searching for and using resources like solution