got it backwards

[Phil Payne]

> Both gasses are difficult to handle. Hydrogen burns with an invisible flame
> (see next paragraph), and both the hydrogen atom and the helium atom are so
> small that they seep through seals and gaskets even faster than pentosin.
> In helium airships, the loss of helium through the envelope can be as much
> as one or two percent every day!

Hydrogen molecule - helium atom.

Liquid helium also has an interesting habit of not staying where you put it and wandering
about the place.

--
  Phil Payne
  http://www.isham-research.com/quattro
  +44 7785 302 803
  +49 173 6242039