Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
roakey once bubbled...
Except for the weight of air. I got mine from my CRC Handbook of Chemisty and Physics, and trust me, it's about 13cf per pound.
This also coincides with the more accurate cylinder swings published.
Roak