Ozone is an unstable gas obtained by the ionizing action on oxygen of an electric field derived from a high potential, a violet discharge is the visible result. Ozone is obtained industrially by passing a current of air or oxygen between two electrodes subjected to an AC potential difference.
To avoid the formation of an arc, one or sometimes both electrodes are covered with a dielectric of uniform thickness forming an equipotential surface.
The potential difference applied to the electrodes obviously depends on the type and thickness of the dielectric and the width of the ionization gap; in practice it is between 10,000 and 20,000 V.

Ozone is an unstable gas obtained by the ionizing action on oxygen of an electric field derived from a high potential, a violet discharge is the visible result. Ozone is obtained industrially by passing a current of air or oxygen between two electrodes subjected to an AC potential difference.
To avoid the formation of an arc, one or sometimes both electrodes are covered with a dielectric of uniform thickness forming an equipotential surface.
The potential difference applied to the electrodes obviously depends on the type and thickness of the dielectric and the width of the ionization gap; in practice it is between 10,000 and 20,000 V.