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More ways to get Braingle...

Which is Heavier?

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

 

Puzzle ID:#37426
Fun:*** (2.56)
Difficulty:** (1.11)
Category:Science
Submitted By:TheSmartest*us***

 

 

 



If you fill a 5 gallon bucket with cold water and another 5 gallon bucket with hot water, which bucket will be heavier?




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Comments

FutureMDAus**
Jul 16, 2007

Easy for me becuase the last unit I did in Science involved thermal explansion, but I doubt it will be as easy for every one else. Good teaser!
pokpic*us*
Jul 16, 2007

easy but good teaser
RedPythonAgb
Jul 16, 2007

An Interesting fact. It's always good to read these science teasers.
Don't be disheartened by comments that will almost certainly follow telling you it was too easy. With this type of teaser you either know the answer or you don't. Many people will have learnt something new by reading your teaser. As an extra challenge people can ask themselves if the answer would be the same if the cooler water was cooled to a state where it was solid (i.e. 5 gallons of ice) and would the answer be the same if the liquid in question was not water. What would the differences in weight be for hot, cold and frozen liquids other than water (such as oil or ethanol)?
empyAca*
Jul 16, 2007

Interesting. I automatically thought of steaming hot, nearly boiling water and thought of evaporation. Molecule spacing never occurred to me.
cooltigerr1Aus*
Jul 16, 2007

WAYYYYYY EASY! but i liked it
HarryPutter*ca*
Jul 16, 2007

too easy!but nice!
coltonr1Aus*
Jul 17, 2007

That was pretty good. A little bit hard.
The-stranger0Aus*
Jul 17, 2007

kind of obvious you think?
SPUTNIK2Aus*
Jul 17, 2007

very interesting, good one!
happyhakAen*
Jul 18, 2007

Easy! Got it on my first guess!
spinnercatAus**
Jul 20, 2007

I got it on my first guess. (But it was a 50-50 chance so I shouldn't be that happy.)
bobobearAfj*
Jul 31, 2007

i thoght it was hard
SandUtilAus*
Aug 06, 2007

that was easy! Yeah.
jazzmusician46Aau*
Aug 07, 2007

Good one! I didn't know...that's because I'm not a science buff (and probably most people on here aren't either), so good teaser. I learnt something new today. Thanks.
billhardy
Sep 14, 2007

the cold watermolecules aren't denser. They are packed c;oser tp gether, and there are more of them om the bucket, that there are in the hot water bucket.
TheSmartest*us*
Sep 14, 2007

Billhardy: I do believe that denser means "packed closely together" or "closer together" .....

DUH.
IQ_masterAsg
Oct 14, 2007

thats kinda easy (:
browns2397tus
Oct 14, 2007

for me,that is a simple question



The answer is Cold \

make harder questions!
AndrewWalkerAfi*
Nov 05, 2007

That's only true if the water is no colder than 4 deegrees C. Ice is 9% less dense than liquid water.
ElectronJohn*us*
Nov 28, 2007

I agree with Andrew. You need to know the temp of the water to answer the question correctly. Ice floats in water because it is less dense then the liquid water around it.
ElectronJohn*us*
Nov 28, 2007

Actually this is very much like my "cold and warm gasoline" teaser I submitted a few years back. This is probably not considered a duplicate though since you are talking about water and weight and mine is dealing with gasoline and volume.
moody12345*us
Nov 28, 2007

I wasn't quite sure what it was....... then I read the answer. That was a very interesting fact!
CatsAreCute**
Jan 15, 2008

Fun! But TOO EASY!!!
rockstar1234567Aca*
Jan 26, 2008

i love science
friesaregoodAus*
Apr 17, 2008

Wow, that's interesting!
tangled_brainAus*
May 04, 2008

you're right, "Smartest," but your answer is not. "Denser" does mean packed more closely together, but you used the word wrong. The Molecules are not denser, they are all the same H2O-the 5-gallon sample is denser. They both have the same volume, but the cold sample actually has more molecules. Also, when measuring the volume, the meniscus would be minutely different- the hotter sample's meniscus would be flatter, making you even put fewer molecules in your container.

Of course, this is all on a ridiculously small scale.

BTW, DUH.
Wa11E*en*
Sep 20, 2008

Are we have heavy water!



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