Discussion
A flow rate quoted in normal cubic metres per hour refers to volume measured at
Answer: C
Correct answer: a stated reference temperature and pressure
A normal cubic metre is a fixed quantity of gas, expressed as the volume it would occupy at a stated reference condition - commonly 0 degrees Celsius and one atmosphere, though the reference must always be checked since standard cubic metres and feet use others. Quoting a gas flow at actual line conditions would say nothing about how much gas was passing, which is precisely why the convention exists.
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