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This picture shows a gas discharge tube containing helium.
See images of other noble gases: Neon · Argon · KryptonPhotograph: Alchemist-hp
There are two references on the page implying that helium was only used as a replacement for hydrogen after the Hindenburg disaster. This is false. The US operated helium-filled airships contemporary with the Hindenburg, including the USS Akron (ZRS-4) and USS Macon (ZRS-5). The Hindenburg used hydrogen because they didn't have access to helium, a resource extracted from natural gas deposits available only to the US and Russia. Neither were willing to sell this strategic military resource to Nazi Germany for obvious reasons. The Hindenburg's use of hydrogen was a political issue, not an engineering/science issue. — Preceding unsigned comment added by 24.108.138.101 (talk) 20:32, 25 February 2024 (UTC)
What color does radon glow in an electric discharge tube? Did someone get rid of it, or am I mistaken? 2600:1008:B11F:5DF9:2099:8782:E2A8:765E (talk) 21:11, 30 August 2023 (UTC)