Since then, naval applications have increased to the point where many ingenious hydraulic devices are used in the solution of problems of gunnery, aeronautics, and navigation. Aboard ship, hydraulic power is used to operate such equipment as anchor windlasses, cranes, steering gear, remote control devices, and power drives for elevating and training guns and rocket launchers. Elevators on aircraft carriers use hydraulic power to transfer aircraft from the hangar deck to the flight deck and vice versa. This combination is referred to as hydropneumatics. An example of this combination is the lift used in garages and service stations.
Air pressure is applied to the surface of hydraulic fluid in a reservoir.
The air pressure forces the hydraulic fluid to raise the lift. The material that makes up the universe is known as matter. Matter is defined as any substance that occupies space and has weight. Gases not only take the shape of the containing vessel, but also expand and fill the vessel, regardless of its volume. Examples of the states of matter are iron, water, and air.