Another theory is that the bottles were used for liquids.
The Twaddell scale is only used for liquids with specific gravity greater than water.
Sometimes permeability to gases can be somewhat different that those for liquids in the same media.
Flexible tanks are a kind of storage equipment for liquids such as water or oil.
"These are clearly evolved for drawing liquids," he said, and looked up with a black chuckle.
Used for corrosive liquids, so that the chamber metal can be of low cost.
It can also be used for liquids and casseroles.
Soft body physics are also used for particle effects, liquids and cloth.
The general standard for liquids is 31.5 gal or half a hogshead.
At the halfway point there was a brief break for much-needed liquids, then back to work.