youtor.org
Bimetallic Jumping Disk
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=ECReCtxOqJY
The sky's the limit for these disks, which have two layers of bonded metals with different thermal expansion properties. A change in temperature causes these disks to jump into the air! Simply warm the disk with your hands, snap it, place it on a table, and watch it fly! Available from Educational Innovations, Inc. at http://www.teachersource.com/product/...
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