f990dc30_ion__and_Energy__Build_a_Blimp__Explain
[Steps] Depending on drafts in the room, the blimp may float higher toward the ceiling or lower toward the ground. If it continues to float and stay at the ceiling, then students should add more paper clips. If it sinks to the ground and stays there, students should remove paper clips. [Explain] 
Depending on drafts in the room, the blimp may float higher toward the ceiling or lower toward the ground. If it floats to the ceiling, then you should add more paper clips. If it sinks to the ground and stays there, you should remove paper clips.
Force, Motion, and Energy: Build a Blimp
Explain