I WONDER - What Is A Fluorescent Lightbulb?

The video explains how gas mixtures, typically containing mercury vapor, emit ultraviolet light when excited by an electric current. This ultraviolet light then excites a phosphor coating inside the bulb, producing visible light. These bulbs are more energy-efficient than incandescent bulbs but contain mercury, a toxic element.

What type of gas mixture is usually contained in these bulbs?

How does ultraviolet light contribute to the production of visible light in these bulbs?

What happens to ultraviolet light when it is excited by an electric current?

What are the advantages of using these bulbs compared to incandescent light bulbs?

What toxic element do these bulbs contain?