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  1. ... Helium gas 0.18 kg/m³ Density of Air 1.28 kg/m³ 10 pounds = 4.5 kg buoyancy force of helium is the difference between the above numbers, or about 1.1 kg/m³...

    2 Answers · Science & Mathematics · 02/05/2009

  2. ...much identical to that at the ground. However, if you anchor with a 10 feet rope, then you need enough helium to lift the person, the chair and the rope. Helium lifts because ...

    5 Answers · Science & Mathematics · 06/08/2008

  3. Not enough to make it float away, if that s what you re after...

    1 Answers · Science & Mathematics · 20/01/2011

  4. ...the numbers you give you also need to know: 1. thermal expansion coefficient of helium 2. average temperature rise of helium in baloon 3. density of air and you can easily perform...

    2 Answers · Science & Mathematics · 21/06/2010

  5. ...periodic table General Name, symbol, number helium , He, 2 Chemical series noble gases...pressure (defined by ITS-90) P/Pa 1 10 100 1 k 10 k 100 k at T/K 1.23 1...

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

  6. ...t work. You need a much larger balloon than that raft. The helium filled raft would not even lift it's own weight, let alone your weight. Assuming a weight of about 10 pounds (5 kg), and a volume of about 6" x 9' x 3', that ...

    6 Answers · Science & Mathematics · 01/04/2013

  7. First, helium is the gas used to float most balloons, not the composition of...

    1 Answers · Science & Mathematics · 24/08/2009

  8. ... reliability if they contain leaks. Capabilities of the Helium Leak Test are listed below. * leak rates down to 10 ^- 10 mbar l / s can be detected * both objects with vacuum or overpressure...

    5 Answers · Science & Mathematics · 28/06/2009

  9. ...1m^3 of He the lift would be the weight of the air minus the weight of the Helium so Wair-Whe= 10 .142 N/m^3 of lifting force. So that would give you 2.28lbs/m...

    1 Answers · Science & Mathematics · 15/11/2011

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