The volume fraction of argon in the air is 0.9%. How much air is needed to produce 125 m3 of argon?

Given: ϕ (argon) = 0.9%, or 0.009, V (argon) = 125 m3.
Find: V (air) -?
From the formula for finding the volume fraction of argon ϕ (argon) = V (argon) / V (air), we find the volume of air:
V (air) = V (argon) / ϕ (argon) = 125 m3: 0.009 = 13888.89 m3.
Answer: 13888.89 m3.

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