Question

Michael Faraday discharge tube with limitation?​

Answer 1

Michael Faraday and others had begun to study the effect of an electric current on a gas. Faraday's apparatus consisted of a pair of metal plates sealed in a glass tube as shown. The tube was filled with a gas, the metal plates were connected to a series of batteries, and the gas was slowly pumped out of the tube. Faraday noticed that when the pressure of the gas in the tube became small enough, the gas began to glow.