Helium
External links
;General
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- WebElements: Helium
- It's Elemental – Helium
- Helium at the Helsinki University of Technology; includes pressure-temperature phase diagrams for helium-3 and helium-4.
- Helium Safety regarding inhalation
- Physics in Speech with audio samples that demonstrate the unchanged voice pitch
;More detail
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;Miscellaneous
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~ Table of Content ~
| ► | Introduction |
| ► | Notable characteristics |
| ► | Electron energy levels |
| ► | Applications |
| ► | History |
| ► | Occurrence |
| ► | Isotopes |
| ► | Vocal effect and health precautions |
| ► | References |
| ► | External links |
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