- arc welding-non reactive when you use high temperatures. its safer
- growing crystals- it is used for silicon crystals when scientist grow silicon it has to be in a pure environment. argon is used because it will not react to silicon
- lightbulbs- when u look into a light bulb it looks like there's nothing there but there is. argon is there it is a gas that lets the light bulb keep working
- vacuum tubes- When you look at a radio they are very small. Many years ago, radios used to be much larger and had big glass tubes inside. Those radio tubes were filled with argon gas.