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a brown-skinned woman swimming with a baby on her back and one near her, with a tree and some grass

Caribbean woman swimming with two children: lungs project

Your lungs as swim bladders

Your own lungs still can act a little like swim bladders. Here’s a lungs project: When you go swimming at the pool or in the ocean or a lake, try taking a deep breath and floating while you hold your breath. Then try blowing out all the air, and floating.

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For further thought

Which is easier? Do you float higher in the water with your lungs full of air, or empty? Does it matter how long you hold your breath?

History of swimming

President Obama swimming with his daughter

President Obama swimming with his daughter

Find out more about breathing
History of Swimming

Bibliography and further reading for your lungs project:


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