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25th Jul 2003, 21:24

#10 (permalink)

PhilD

Join Date: Jun 2001

Location: London, England

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parris

When fuel (or water or any other liquid) is heated it expands, so your 6lbs of fuel occupies more than 1 US gallon (which is a unit of volume). The other way of looking at this is that a gallon gets lighter as you heat it up.