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-   -   Project about weight change.. need help! (http://classroom.all-science-fair-projects.com/forum/showthread.php?t=1507)

allforyou 02-10-2006 01:27 PM

Project about weight change.. need help!
 
ok my sons class room is having a contest. here is what students need to do. They need to find an object that over time, decreases in weight, , preferablly within 24 hours. this object hsould be the size of a shoebox. This has got us puzzled..im thinking we can use dry ice, but how long would it take for dry ice to evaporate... and would that leave a mess? please help we are desperate :)

alyssaaa25 03-20-2006 03:00 PM

hmm
 
umm i dont really know that much about this subject...but does dry ice evaporate? and since its dry...how could it leave a mess?

All Knowing 03-21-2006 09:01 AM

Well if it melts it wont work because the water will weight the same as the cube


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