What is the function of the cylinder in a hydraulic elevator jack?

The cylinder in a hydraulic elevator jack serves a critical role by holding the hydraulic fluid (oil) and housing the plunger. This setup is essential because the hydraulic fluid is manipulated to create pressure, which subsequently enables the movement of the plunger. When the fluid is forced into the cylinder, it pushes the plunger upward, which ultimately raises the elevator car. By containing the hydraulic fluid and providing a housing for the plunger, the cylinder facilitates the entire lifting mechanism in a hydraulic elevator system. Thus, it is the fundamental component that allows for the proper functioning of the hydraulic system in raising loads.