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The Periodic Table

The Noble Gases - Uses (continued).

Argon

1) Is the gas used to fill electric light bulbs.
It prevents the very hot tungsten filament (wire)
from burning out (reacting with oxygen in the air).

2) Is the cheapest noble gas since it is present as about 1% of the air.
It is used wherever a cheap inert atmosphere is required,
for example the extraction of titanium or metal welding
(inert atmosphere means unreactive gas).

3) Is used in lasers.


Krypton is used in very bright electric lamps,
such as photographic flash lamps, and stroboscopes.
Krypton is also used in lasers.

Xenon is used in the brightest lamps in lighthouses.

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