Plasma is the most common state of matter in the universe. When the electrons collide with the gaseous atoms and molecules inside the glass globe, the gas particles are ionized creating even more electrons, as well as positive ions. A plasma is formed. When electrons return to the ionized gas, light is produced. Touching the globe with your finger provides a ground, an additional source or "sink" of electrons.

The Plasma Ball demo contains a plasma ball, oscilloscope, circular fluorescent bulb, LED lights, and an extension cord with power strip.