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The Noble Gases - Uses (continued).
Neon
1) Is used in advertising
signs.
Neon glows red when an electric
current is
passed through it.
2) Is the 'starter gas' in sodium street
lamps.
Neon conducts electricity
when the lamp is first switched on,
and warms the lamp until the sodium
vapourises,
which then conducts and glows yellow.
The yellow mixes with the red neon and the
lamp appears to be orange.
This is why street lamps glow red first
and then orange.
3) Neon is used with helium in
some lasers.
(The common red
laser is helium-neon).
Continued on the next page.
Headings Noble
Gases Search Questions ![]()
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