f990dc30_ion__and_Energy__Build_a_Blimp__Explain
[Steps] When students hold the straw, the balloons should sit next to each other. [Explain] 
One way to arrange the balloons is to position them behind one another. You can also place them side by side, but you will need to modify your straw so that it is long enough to connect the balloons.
Force, Motion, and Energy: Build a Blimp
Explain