What is described as a system for moving items using pressurized liquid?

Hydraulics is the system that utilizes pressurized liquids to move items or apply force. This technology is based on Pascal's principle, which states that a change in pressure applied to an enclosed fluid is transmitted undiminished throughout the fluid. This means that when a liquid is pressurized in one area, it creates movement and force in another area, allowing heavy objects to be moved or lifted efficiently. Hydraulics is commonly used in various applications, including construction equipment like excavators and hydraulic lifts, where significant force is needed to lift or manipulate heavy loads.

The other options refer to different systems: pneumatics uses compressed air instead of liquids, mechanics deals with the principles of motion and forces but does not specifically rely on pressurized fluids, and electronics involves systems that manipulate electrical signals rather than physical movement using liquids or gases.