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Estimate the compressed air tank volume required to store an amount of energy equivalent to one gallon of gasoline if the air will be stored

Estimate the compressed air tank volume required to store an amount of energy equivalent to one gallon of gasoline if the air will be stored at a pressure of 3000 psia. Assume slow (constant temperature) compression, and use 46.4 MJ/kg for the energy density of the gasoline. 

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