Hydraulic fluid with a Sg of 0.95 and a kinematic viscosity of 0.02 Newts is flowing through a 3/4 in. I.D. line at 35 gal/min. If a 3/4 closed gate valve is inserted in the line, what pressure drop could be expected?

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.