[Gasification] Gasification Digest, Vol 19, Issue 10

[Richard Haard]

In extraction of helium from natural gas they use teflon membranes or  
filters to separate this element from the more massive methane  
molecules. I believe though there is a patent in this application.
On Jan 12, 2008, at 9:40 PM, Mark Ludlow wrote:

> Andy,
>
> Andrew is most often spot-on in his replies but your question got me
> thinking. The reason that your hydrogen left your balloons was that  
> 1.) its
> molecular radius is so small that it easily traversed the broader  
> molecular
> matrix of your latex balloons and it headed toward a lower pressure  
> (lower
> H2 partial pressure) destination.