How does florescent lights contain plasma?

Fluorescent lights contain a low-pressure gas, typically Mercury vapor, which becomes ionized when an electric current passes through it. This ionization creates a plasma state, where free electrons and ions exist. The plasma emits ultraviolet (UV) light when energized, and the inner coating of the bulb, usually made of phosphor, converts this UV light into visible light. Thus, plasma plays a crucial role in the functioning of fluorescent lights.