Gases do not have a fixed volume. Stating the quantity of a gas as a volume without stating temperature and pressure means nothing, since it can be any amount.
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It means 1 liter of methane. I find that that has a very clear defined meaning.
Your teaching may want you to say that it says nothing about the mass if you do not know the pressure.
Your teaching may want you to say that it says nothing about the mass if you do not know the pressure.
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Because your average fart is bigger than that.