Helium
From GAWDAwiki
Helium (He) is the lightest of the inert gases. Due to its light weight, approximately two to three times more helium is needed to shield a weld area than argon. However, helium can be used with greater arc voltages than argon, which is why helium is preferred when working with thick metal sections.[1]
Contents |
Properties
- Molecular formula: He
- Atomic number: 2
- Atomic weight: 4.002602
- Melting point: -458.0°F (-272.2°C or 0.95 K)
- Boiling point: -452.07°F (-268.93°C or 4.22 K)
- Density: 0.0001785 grams per cubic centimeter
- Phase at room temperature: Gas
- Element classification: Non-metal
- Period number: 1
- Group number: 18
- Group name: Noble gas[2]
References
- http://www.amtonline.com/publication/article.jsp?pubId=1&id=1685&pageNum=1
- http://education.jlab.org/itselemental/ele002.html
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