What Causes the ‘Glow’ of a Neon Light?

Imagine you're inside a tiny, magical world where electrons dance around atoms like they're playing tag. When electricity zaps the gas inside a neon light, it makes those electrons jump to higher energy levels and then fall back down, poof! That’s when the glowing starts. The kind of glow depends on what kind of gas is inside the tube.

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Examples

A neon light glows red because electrons in the neon atoms emit red light when they fall back down.
When you turn on a streetlight with argon gas, it glows blue like the sky at night.
The colorful signs outside bars use different gases to make each letter shine with its own color.

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Categories: Physics · neon light,glow,gas discharge,electron excitation,light physics