It is listed by weight so that it can be expressed as a single number.
If you express it as a volume, you have to also give temperature and
atmospheric pressure to be precise about the quantity of gas.
On 2007-06 -19, at 20:42 , Harry Wyeth wrote:
We read a lot about xxx tons of CO2 or whatever, but I have trouble
imaging the weight of a volume of a gas. I have read that water is
about 800 times denser than air, so from that one could calculate
the weight of a cubic meter of air, for example. But how about
other gases? Is there a metric rule of thumb? Why do engineers
measure the output of a gas by weight in the first place?
HARRY WYETH
