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## Homework Statement

can someone explain why we are interested in forming dimensionless products

and why only n-j of them should be formed from the problem's variables?

## Homework Equations

Step 1: List the variables in the problem

Step 2: Express each of the variables in terms of basic dimensions

Step 3: Determine the number of Π parameters. Buckingham Pi Theorem says we have k=n-j terms

Step 4: Select j repeating variables from the n variables

Step 5: Use the three repeating non-repeating variables to form k=n-j Π terms

Step 6: Express the final form: Π1 = f(Π2,Π3)

## The Attempt at a Solution

the only thing i know so far is that physical laws are independent of the system of units used