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Or check out some of this interesting mumbo jumbo:
The Hubble-barn is about 13 liters, depending on your current favorite value for Hubble's constant (H). This is the volume of a straw that has the cross-sectional area of a barn (a nuclear physics cross-sectional area equal to 100 square femtometres, roughly the size of a largish nucleus) and a length equal to the radius of the universe (given by H^{-1}c). (That means a gallon of milk has roughly the same volume as a straw with the area of a medium-sized nucleus such as Silicon that reaches to the end of the universe...:shocked: )[/i]
or...
You could measure the gas mileage of a car in inverse acres. To calculate the inverse gas mileage, you drive as far as you can with one gallon, then you make a very long skinny hose whose length is the distance you drove and whose volume is exactly one gallon. You then measure the area of the cross-section of the interior of this hose in acres. Now take the reciprocal.
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