We’ve all heard of “solid,” “liquid,” and “gas.” The Three States of Matter. In physics and chemistry, plasma is a state of matter similar to gas in which a certain portion of the particles are “ionized” – that is, stripped of electrons so that the atom now has an electric charge. Heating a gas can ionize its molecules or atoms, thus turning it into a plasma, which is composed of positive-charged ions and negative-charged electrons. Ionization can be induced by other means, too, such as a strong electromagnetic field applied with a laser or microwave generator, and the process not only strips away electrons, but also is accompanied by the break-up of molecular bonds (the bonds holding together the molecules of the original gas), if present. Our Plasma Sphere lets you see and interact with plasma.