Throughout the liquid pressure is consistent, so that in the equilibrium system, the relatively small above the piston applied pressure on smaller, and the pressure exerted on the piston is relatively large, this can remain liquid at rest. Through the transfer of liquid, you can get a different pressure on the different ends, you can achieve the purpose of a transformation.
Jack has mechanical jack and hydraulic jack, hydraulic transmission is based on the most basic principle is the Pascal principle.
We are common to the hydraulic jack is the use of this principle to achieve the transfer of force. Mechanical principle of a screw jack, to and fro by pulling the handle, pull claw namely to promote Rotary ratchet gap, small bevel gear drives a big bevel gear, the lifting screw rotation, so that the lifting sleeve for lifting or dropping, and reaching up to the heavy force function