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Water or Ice?

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

 

Puzzle ID:#50014
Fun:*** (2.83)
Difficulty:* (0.98)
Category:Science
Submitted By:eighsseAus******

 

 

 



Which weighs more: a gallon of liquid water or a gallon of ice?

(With "weight" meaning, weight on the same planet, at the same location -- so literally, "which has more mass?")


Answer

A gallon of liquid water weighs more than a gallon of ice.

Many people might be thinking of an actual gallon jug of water, weighed at liquid, and weighed frozen (in which case they would be equal, if you remove any condensation or frost). But the question does not refer to a jug; it refers to a gallon. A gallon is a precise measurement of liquid capacity. Ice is less dense than liquid water, so a precise gallon of ice weighs slightly less than a precise gallon of water.

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