GCSE SCIENCE CHEMISTRY HIGH SCHOOL - Noble Gases - Uses of Neon - Advertising - Street Lamps - Laser

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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.

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