No 8. e-ENGineer

One for the electrical engineers, this app allows for almost all the calculations required by them.

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No 7. Pressure drop calculator

Quite a handy app for professionals and students alike. You have to enter the fluid flow rate, internal pipe diameter, fluid density, fluid viscosity, pipe roughness factor along with the equivalent length in either pump runs or a combination of piping, plus valves and fittings and this app will give you Reynolds number, Fanning friction factor, pressure drop and fluid velocity in the pipe. Phew!

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