All the physical parameters, such as energy, force, velocity, and acceleration are constructed from two different kinds; one is real and the other is imaginary. Their acting directions are normal to each other. The former acts horizontal direction and causes visible kinetic movement on fluid particle. All the supplied energy is utilized and consumed. The latter acts vertical direction but does not cause any visible kinetic movement on fluid particle. All the energy transfer from mechanical to hydraulic and from hydraulic to mechanical is caused by the imaginary parameters in vertical direction.

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