Discharge tube

Chemical formula

Molecular formula

Electrical discharge

fluorescent materials

A tube containing charged electrodes and filled with a gas in which ionisation is induced by an electric field

It is a representation of a substance using symbols for its constituent elements.

It is a formula giving the number of atoms of each of the elements present in one molecule of a specific compound

Electricity, when passes through air, removes the electrons from the gaseous atoms and produces ions

When invisible radiation falls on materials like zinc sulphide, they emit a visible light