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25th July 2003 | 21:24

#10 (permalink)

PhilD

Joined: Jun 2001

Posts: 191

Likes: 0

From: London, England

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.