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wrote:
George E. Cawthon wrote:

mawtg wrote:

does anybody know how a gas cylinder measuring 6" dia and 32" tall can
have 80 cu ft of gas? how is this figured?

The answer is that it can't.
...
It is unfortunate that school don't teach, or the
students don't learn, the states of matter and the
basic properties of those states. Seems to me
that would be more important that the colors of
the rainbow and a few other things kids are taught.

A standard measure of gas is the _standard cubic foot_ which
is the amount of gas that will occupy a volume of one cubic
foot at standard temperature and pressure, usually abbreviated
SCF. You see it most often in reference to volumetric
flow as through a blower or a fan, SCF/minute or whatever.

The standard pressure is one atmosphere. Unfortunately the
standard temperature is either 0 degees C or 'room temperature'
(which I think is around 70 degrees F) depending on which
standard is used, though that makes only a small difference.

So when you buy gas by the cubic foot, you are buying by
the standard cubic foot, the seller usually omits the
word 'standard'.

All true. But none of that changes the fact that
the question is erroneous.