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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: (2.86) Difficulty: (1) Category: Science Submitted By: eighsse

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?")

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## Comments

 devaprasad Dec 09, 2013 Good one :poop: devaprasad Dec 09, 2013 eighsse Dec 09, 2013 Thanks... I think? charlottes-odd Dec 17, 2013 Good one again ElectronJohn Mar 31, 2014 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. eighsse Mar 31, 2014 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." BadBunnee02 Apr 02, 2014 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? ) 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? eighsse Apr 02, 2014 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. Babe May 04, 2014 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! lukasiwicz May 04, 2014 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." raisin99 May 04, 2014 Nothing like a little science to get the brain in motion for the day; thanks! eighsse May 04, 2014 Great point, lukasiwicz, I didn't even think about that! It is probably inaccurate to say a "gallon of ice." auntiesis May 04, 2014 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. auntiesis May 04, 2014 Sorry I forgot to mention this was a great teaser. Thanks. BadBunnee02 May 04, 2014 Hey ... eighsse .... DOUBLE congrats are in order. Great teaser AND TOTD !!!! How nice !! BB02 eighsse May 04, 2014 Hey thanks everybody

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