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A comment on The Increasing Scarcity of Helium. Parent comment

Re:The Increasing Scarcity of Helium by afarrell on Wednesday June 17, 2015 @09:44PM (#9736313)
Should this be in price per kilo or price per mole? Argon is denser than helium.
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Re:The Increasing Scarcity of Helium by WildUtah on Wednesday June 17, 2015 @09:57PM (#9736382)
One mole of gas at STP takes up 22.4 liters. He now trades at $10-20 a kilo, I think. Enjoy all the unit conversions you need.
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