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How would ... helium filled ballon move in a space shuttle cabin if it was1 >>
You might ask the student what happens if you poke a hole in the2 >>
Within the space-shuttle, the results would also be affected by the air within the cabin. I think the post above would lead a student nicely to what would happen with a 'lead' balloon. What is the best way to include the conceptual switch from lead to He? I am not sure...pl >>