It is Measured in Volume as Cubic Feet
In Canada its measured in litres but some places are different.
None. Gas is not measured in square metres.
BTU`s are measured in cubic feet
It Measured By Grams
No natural gas is natural gas.
No natural gas is natural gas.
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it is measured by geologic time
Natural Gas
Gas that is natural.
Natural gas is a gas.
CNG is compressed natural gas