Doesn't matter what you substitute the joke is unworkable.
Kirk: Which weighs more, a gallon of water or a gallon of butane?
Spock: That would depend on their relative densities, captain. I would first have to ascertain if the butane is under pressure...
Kirk: oh, Forget it. .... Sulu! Which weighs more, a gallon of water or a gallon of butane....?
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