Have you ever lifted boot trunk lid or a boot of your car with one finger? Did you wonder how is it possible to lift heavy metal and glass with a little force? This is because of piston-like hinges supporting either side of the gate. They are known as gas springs which have made our life easier in various things. Another example of gas spring is your office chair when you release the height lever underneath the chair, you will feel that gas in the spring is being compressed and slowly brings you down. It has several other functions. A good quality material is used to manufacture it for sturdy life.
It has a very much similar mechanism like a sturdy bicycle pump without pressurized nitrogen gas and oil which is sealed up to stop them from escaping. Here, gas allows spring to keep energy whereas oil damps the piston movement and offers lubrication. When it comes to the gas spring, force is applied to the piston rod and piston into the cylinder which compresses the gas. When stopped pressing, the gas pressure pushes the piston to its original place. This may sound like a bicycle pump, but its working is different. In a gas spring fluid flows through or around the piston from one or the other side to make sure pressure is the same on both sides. But the created pressure acts over a greater area in the inside surface than on the outside of the piston. This means more force inside than outside. This is how gas spring builds force when it is pushed.