Pi theorem
From Glossary of Meteorology
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Pi theorem
(Or Buckingham Pi theory.) The basis for dimensional analysis.
The theorem states that an equation for a physical system that can be written f(Q1, Q2, . . . , Qm) = 0 can also be written as g(π1, π2, . . . , πm - n) = 0 where Qi are m dimensional parameters, numbers, and variables; πi are m - n nondimensional quantities; and n is the number of fundamental dimensional units.
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