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. Plasma is the ionized state of matter. Ionization is the phenomenon where molecules or atoms break apart into electrons and ions. ハカセ Plasma is created when particles—ions, electrons, and atoms—collide with each other. Under what conditions does plasma form? はてなさん ハカセ Primarily, plasma occurs in extremely high-temperature regions such as the sun, or when high voltage is applied to a gas. This time, we will analyze fluorescent lamps, an ...