Geissler apparatus

The Geissler apparatus is a scientific device used to demonstrate the behavior of gases under low pressure. It typically consists of a glass tube filled with a low-pressure gas, often containing electrodes at each end. When electricity is passed through, the gas emits light, creating colorful glows and patterns. This apparatus helped early scientists understand gas properties and laid the groundwork for advanced research in fields like spectroscopy and neon lighting. While now largely replaced by more sophisticated technologies, it remains an important historical tool in the study of electricity and gas behaviors.