My discovery: neon lights

In the evening, I went to the square with my parents.

When I walked, I found that the neon lights along the way emit a variety of light, red, blue, light green, and yellowish... I think: Why do neon lights emit these different colors? The general lighting is white. Is it a layer of plastic paper of different colors on the outside of the lampshade? Or is there a layer of pigment on the tube? I was puzzled and asked my mother: "Mom, why does this neon light emit these colorful lights? Is it painted on the tube? Or is it wrapped in a plastic sheet on the lampshade?" Mom replied: "Because of the neon lights There is a rare gas in it. What kind of gas is it? I don't know it. Go home and check the information!"

After returning home, I checked that I should know that there should be three hundred questions about natural knowledge. It turns out that neon lights are illuminated by the action of gas discharge. After energization, light is emitted by the excitation of the electric field. Because the inert gas filled in the neon is different, the color of the glow emitted is different. For example, helium can emit red light, argon can emit light blue light, helium can emit yellow light, and helium can emit orange light...

Oh! It turned out to be a variety of different gases, let the neon lights emit colorful light, and the colorful colors of the city make the night city so beautiful.

Fourth grade: tony14