- Plasma ball
Touch the plasma ball with your fingers and watch the plasma filaments.
A plasma ball is a sealed glass containing low-pressure noble gases. A high voltage electrode sits in the center of the ball, connected to the power source. When the ball is turned on, electrical current ionizes the gas in the ball, creating plasma. When you touch the surface of the plasma ball, you can see the path of the plasma filaments running between the electrode and the insulating glass shell.