Note that every equation has to be dimensionally consistent. The units on the RHS of any equation have to be the same as the units on the LHS. Verify that the Hagen-Poiseuille equation Eq. (1.20) is dimensionally consistent.The history of the Hagen-Poiseuille equation has been summarized in a paper by Sutera and Skalak (1993). What are the main points discussed in this paper?

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R4 Q= (Po-PI) 8L (1.20)