10 Jun
2007
10 Jun
'07
2:59 p.m.
On 10 Jun 2007 at 13:58, jd wrote:
Not too long ago a 5ft cylinder of 99.995% helium @
3600psi costs $75.00 plus
whatever deposit and demurrage, and the same cylinder of 99.95% argon @ around
1200psi cost around $100.00. There's much more helium in the cylinder than argon.
I'm sure nitrogen was more expensive. I remember thinking that it was odd that
common nitrogen was so much more expensive than helium.
My thought was that helium would diffuse out through the tiniest
opening or porous seal quite rapidly. On the other hand, argon
doesn't even come close to helium's thermal conductivitiy.
Cheers,
Chuck