Any gas balloon pilots here?

On Wed, 05 Mar 2008 05:25:22 -0000, Jim Logajan
wrote in :

Larry Dighera wrote:
On Tue, 4 Mar 2008 14:47:54 -0800 (PST), Ricky
wrote in
:

hydrogen is a stronger lifting gas than helium.

The atmospheric displacement of hydrogen (H2 MW=2), with one fourth
the molecular weight of helium (He2 MW=8), should be a considerably
larger percentage of its mass.

Um, small correction: there is no He2 compound (well not normally).
So H2 MW=2, and He MW=4. Helium is twice as dense as H2 at the same
temperature and pressure.

My 2¢ was just a guess. I knew someone would correct it. Thanks for
the information.

I had no clue about the relative densities. Interesting.

In article Larry Dighera writes:
On Tue, 4 Mar 2008 14:47:54 -0800 (PST), Ricky
wrote in
:

hydrogen is a stronger lifting gas than helium.

The atmospheric displacement of hydrogen (H2 MW=2), with one fourth
the molecular weight of helium (He2 MW=8), should be a considerably
larger percentage of its mass. But because the hydrogen molecule is
physically smaller, containing it within the balloon envelope may be
an issue.

But, the hydrogen molecule is 2 hydrogen atoms, at some distance.
The helium molecule is 1 helium atom, so it is smaller. As I recall,
helium leaks more.

However, from reports, hydrogen tends to ignite rather easily.

Alan