Electricity in a vacuum

The study of electricity in a vacuum involves observing electric currents in evacuated vessels, leading to the discovery of fluorescence in a Geissler tube. This phenomenon, characterized by a greenish glow, resulted from the energetic collision of radiation with matter.
 Julius Plücker Germany 1858 Electricity in a vacuum

The study of electricity in a vacuum involves observing electric currents in evacuated vessels, leading to the discovery of fluorescence in a Geissler tube. This phenomenon, characterized by a greenish glow, resulted from the energetic collision of radiation with matter.