Pipe Flow Calculations Forum

I need help with these problems as I am using the calculator, I am having hard time what formula did they use, # 1 Air at std conditions flows through a 2 std type M copper tube. What is the max velocity allowable for laminar conditions to exist? ( std conds, air can be treated as incompressible) # ...

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need help new here, could not see any of the calculators please help..