Hydraulics refers to the applied science and engineering topic of using a liquid to transmit power through pressure.  The principles are simple.  Pressure applied to one end of a tube that contains a liquid will be transmitted equally to the other end of the tube.

Liquid cannot be easily compressed, meaning the power going in will equal the power coming out.  Pascal’s Law explains how it works “for an incompressible fluid at rest, the difference in pressure is proportional to the difference in height and this difference remains the same whether or not the overall pressure of the fluid is changed by applying an external force”.

In Hydraulics we get Hydrostatic (when the liquid is in stasis, as above,) and Hydrodynamic (when the liquid is moving,) systems.

A Water Wheel is an example of a Hydrodynamic system.

What type of hydraulic system do you think the human heart is?

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