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Water or Ice?

Submitted By:eighsse
Fun:*** (2.85)
Difficulty:* (1.02)

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?")

Show Answer

Comments on this teaser

Posted by devaprasad12/09/13
Good one :poop:

Posted by devaprasad12/09/13

Posted by eighsse12/09/13
Thanks... I think?

Posted by charlottes-odd12/17/13
Good one again :D :D :D :D :D :D :D :D :D :D

Posted by ElectronJohn03/31/14
Good science question, although not hard. By the way a gallon of water weighs about 8 pounds. Not sure how much a gallon of ice weights but as you noted it is less than that.

Posted by eighsse03/31/14
I think a gallon of water weighs precisely 8 pounds, right? Because the English weight system is based upon the density of water. And a gallon of ice would only weigh slightly, slightly less. Mainly the trick is supposed to be that people might imagine having a gallon of water, freezing it, and assume that it is still a "gallon."

Posted by BadBunnee0204/02/14
OK ..... science wizards !!!! What about this one? "Which weighs more .... a pound of feathers or a pound of lead?" I know it's an OLDIE pre-gradeschool joke but I also read recently on the internet (so it's GOT to be true ... right? :roll: ) that almost half of US college grads who were asked that question either got it wrong or ..... ... appeared to have to "think about it"! Is there some trick to that one? :o

Posted by eighsse04/02/14
The trick basically stems from the whole weight/mass confusion. But most scientifically inclined people should get it. Most college grads are drunken idiots anyway. Doesn't take much to merely pass. :D

Posted by Babe05/04/14
Good teaser. I thought it was a trick question, but was thinking of another oldie which was in pounds and not gallons so I should have been more aware. Oh well! :D :roll: :lol:

Posted by lukasiwicz05/04/14
All you had to do was remember that ice floats in water, and hence must be less dense tha water, there therefore lighter than an equal volume of water. Of course, when one considers that a gallon is a liquid measure, and ice is a solid, one might wonder what it means to talk about "a gallon of ice."

Posted by raisin9905/04/14
Nothing like a little science to get the brain in motion for the day; thanks!

Posted by eighsse05/04/14
Great point, lukasiwicz, I didn't even think about that! It is probably inaccurate to say a "gallon of ice."

Posted by auntiesis05/04/14
I think that because water expands when frozen, ice would take up more space. Therefore a gallon of water when frozen would be more than a gallon. Ergo, a gallon of water would weigh more than a gallon of ice. Simple to figure with no scientific knowledge. :lol: :lol:

Posted by auntiesis05/04/14
Sorry I forgot to mention this was a great teaser. Thanks. :D :D

Posted by BadBunnee0205/04/14
Hey ... eighsse .... DOUBLE congrats are in order. :D :D :D :D :D :D Great teaser AND TOTD !!!! How nice !! 8) :lol: 8) :lol: BB02

Posted by eighsse05/04/14
Hey thanks everybody :)


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