Portal:Physics/Selected picture/November 2007
Image:Energy_Arc_(central_electrode_of_a_Plasma_Lamp).jpg
Image credit: User:PiccoloNamek
Plasma is the state of matter that consists of ionized gas. It is the most common state of matter, making up almost 99% of the visible matter in the universe. The term "plasma" was first used in the 1920s by physicist Irving Langmuir.