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Cold or Warm Gasoline?

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#8916
Fun:*** (2.67)
Difficulty:** (1.43)
Category:Science
Submitted By:electronjohn*us****
Corrected By:cnmne

 

 

 



Fred has a choice of putting a gallon of cold gasoline (say 40 degrees F) or a gallon of warm gasoline (say 80 degrees F) into his car. Which choice will result in the greatest mileage?



Answer

Fred would be wise to pick the cold gas. A gallon of cold gasoline will result in greater mileage because it contains more molecules. Gasoline expands when the temperature increases, like most things. And if the measuring container does not expand also to compensate exactly, a gallon of warm gasoline doesn't go as far.
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