glow discharge

Glow discharge is a phenomenon that occurs when a gas becomes ionized in an electric field, leading to the emission of light. When an electric current passes through a low-pressure gas, it energizes the gas molecules, causing them to release energy in the form of visible light. This process is commonly seen in neon signs and certain types of lamps. Glow discharge is utilized in various applications, including plasma generation, surface treatment of materials, and scientific research. It illustrates how electricity can interact with gases to produce both light and useful technological effects.