You're confusing weight and pressure. I quite often hear people refer
to pressure by only saying 'pounds' (I put 35 pounds of air in my car
tire). If that were the case, an inflated car tire would weight
significantly more than a flat tire.
It's been a while since I took chemistry, so please correct me if I'm
wrong: it seems that selling H2 by the kilogram is due to the
connection to molecular weight, which is grams per mol. By using
kilograms, you can determine fairly accurately how many atoms of
hydrogen you're buying.
On 30 Jun 2008, at 21:07, Remek Kocz wrote:
Hmmm, isn't chemical engineering stuck mainly in imperial mode in
the US? I always thought that liquid/solid gases would have been
sold by the pound, since their pressures in tanks are measured in PSI.
Remek
