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How to Build a Working Lung Model

Understand how the diaphragm works!


  • 12 ounce sturdy plastic soda bottle

  • 9" balloon (will be the "diaphragm")

  • 12" balloon (will be the "lung")


  • Cut off the bottom of the soda bottle. Cut off the neck of the 9" balloon. It can help hold the balloon on the bottle if you leave the body-neck transition.

  • Stretch the 9" balloon (without neck) over the bottom of the bottle.

  • Dangle 12" balloon into the neck of the bottle. Keep it completely deflated.

  • Wrap the neck of the balloon around the mouth of the bottle. To create a vacuum for this to work correctly, let the air out of the top of the bottle while pressing in to the "diaphragm" at the bottom of the bottle.

  • Test your lung model!

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