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Argon
The commonest noble gas which makes up almost 1% of the earth's atmosphere. Argon is heavy and used extensively in welding to prevent oxidation.
 Discharge tube Discharge tube.
When several thousand volts are applied to argon gas at low pressure the atoms ionize and a current flows causing light to be emitted at a characteristic mauve wavelength.
Source: custom manufactured
Size: symbol 5" tall
Purity: 99%