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Thanks for that! Not being a native English speaker I couldn't really grasp what the author was trying to describe when he started talking about a "trough with a cross-sectional area of 0.1 mm2" and the following paragraph. This image made everything clear!

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This is probably the kind of trough that's meant: http://en.wikipedia.org/wiki/Watering_trough, detailed image: http://en.wikipedia.org/wiki/Watering_trough#/media/File:Cat....

If you "think away" the actual trough and keep only the liquid, you get the cuboid that the text is referring to.

The kind of trough imagined in the article is actually precedented - although to replenish water and not fuel http://en.wikipedia.org/wiki/Track_pan

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