🚀 go-pugleaf

BROWN BAG NUMBER 11              NAME_______________________
ICE CUBE KEEPERS                 DUE DATE___________________
 
"CAN YOU MAKE A BETTER ICE CUBE KEEPER?"
 
MATERIALS NEEDED:
   small paper cup, ice cubes, newspaper, insulation            materials
(Newspaper, sand, rags, paper towels,              cardboard,etc.)
 
****IMPORTANT****
BEFORE YOU BEGIN, FILL THE SMALL PAPER CUP WITH WATER AND PLACE IT IN YOUR
FREEZER. YOU WILL USE THIS ICE CUBE FOR THE FINAL PROJECT.
 
What can you do to an ice cube to keep it from melting?  One
thing, of course, would be to leave it in a freezer, but where can you put it
at room temperature (about 70 deg F) to make it melt more slowly than usual?
How can you build a good ice cube keeper?  Here are some investigations that
will help you find a way.
 
First of all, how long do you think that it usually takes an ice cube to melt?
If you put an ice cube in a dish, would it be all gone in 10 minutes, 30
minutes, or an hour?
 
1. Estimate how long it will take for your ice cube to melt.
   ______________________minutes.
 
2. Place an ice cube in a dish. Observe the actual time it takes for the cube
to completely melt. _____________minutes.
 
TESTING INSULATORS
 
Materials that help to keep things cold (or warm) are called insulators. Many
refrigerator walls contain fiberglass, an insulating material made from thin
glass fibers. Styrofoam,
another good insulator, is used to make picnic ice chests. It is made by
pumping a lot of air into a batch of liquid plastic before it hardens.
 
Before there were refrigerators, ice was used to keep food
cold in the kitchen icebox. Blocks of ice were cut form lakes in the winter and
then packed with sawdust in a thick-walled ice house. The sawdust was such a
good insulator that the ice could be stored all summer without melting.


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