Ib qho cylindrical hlau uas coj lub piston rau reciprocate linearly nyob rau hauv lub tog raj kheej. Cua nyob rau hauv lub engine lub tog raj kheej converts thermal zog rau txhua yam zog los ntawm expansion; roj yog compressed los ntawm lub piston nyob rau hauv lub compressor lub tog raj kheej kom nce siab.
The casings of turbines, rotary piston engines, etc. are also commonly referred to as "cylinders". Application fields of cylinder: printing (tension control), semiconductor (spot welding machine, chip grinding), automation control, robot and so on.
