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  1. For other uses, see Helium (disambiguation). 2 hydrogen ← helium → lithium - ↑ He... Main article: Isotopes of helium iso NA half-life DM DE (MeV...

    5 Answers · Science & Mathematics · 16/10/2007

  2. Helium (He) is a colorless, odorless, tasteless, non-toxic, inert monatomic chemical element... conditions are also needed to create the small handful of helium compounds, which are all unstable at standard temperature and pressure. ...

    2 Answers · Science & Mathematics · 01/03/2008

  3. ... of the liquid fuel back into heat as the fuel is burned. Helium , of course, does not burn. Neither does Argon. ...

    5 Answers · Science & Mathematics · 14/08/2008

  4. Helium is used primarily for two reasons. Below 210ft, normal...nitrogen is absorbed by the body. Tri-Mix has helium added to it to reduce the relative oxygen and nitrogen content of the air ...

    4 Answers · Science & Mathematics · 09/11/2010

  5. 1] Be prepared for what that much helium is going to cost.... You are ... I have listed. Given that helium is expensive, while you would not want to use straight hydrogen...

    3 Answers · Science & Mathematics · 21/02/2009

  6. Helium conducts heat, as well as any other gas. Helium can conduct electricity...

    4 Answers · Science & Mathematics · 22/05/2010

  7. ... on the density of air and the density of the helium . For simplicity's sake, let's say the air and...small part of the mass of the air displaced by the helium and the object together). Then we can say that you need...

    3 Answers · Science & Mathematics · 07/09/2011

  8. Helium is used as a shielding gas in wire welding ...

    3 Answers · Science & Mathematics · 30/08/2007

  9. Helium is much lighter for the same volume as nitrogen/oxygen air mix. So when your vocal chords vibrate, they cannot move the helium at the same frequency as the regular air. The pitch changes to a much...

    3 Answers · Science & Mathematics · 07/07/2009

  10. Density of Helium gas 0.18 kg/m³ Density of Air 1.28 kg/...7.8 kg or 17 lb but figure on 20% less, as pressure may vary, and the helium will be slightly compressed by the balloon. .

    9 Answers · Science & Mathematics · 16/03/2010

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