Civil Engineering MCQAE Level Civil Engineering
In Buckingham pi theorem, if a physical problem involves n variables and m fundamental dimensions, the number of independent dimensionless pi groups is:
Fluid MechanicsDimensional AnalysisMEDIUM
Choose the correct answer
A
n + m
B
n - m
C
n x m
D
m / n
Correct Answer
B. n - m
Why is this the answer?
Buckingham pi theorem: number of pi groups = n - m, where n = total number of variables and m = number of fundamental dimensions (M, L, T for most fluid mechanics problems).
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