What is plasma Matter is commonly classified into solids, liquids, and gases, but heating a gas further can produce plasma. Therefore, plasma is described as the ‘fourth state’ of matter. This time, we will analyze fluorescent lamps, an industrial product that utilizes plasma. Fluorescent lamps consist of a glass tube, a small amount of mercury, an inert gas such as argon, electrodes at both ends, and phosphor coating the inner surface of the tube.The phosphor absorbs ultraviolet light generated by the discharge and emits visible light. Fluorescent lamps are utilized not only in ‘residential and living spaces’ but ...