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Re:Ask HN: Is it possible to blow up a balloon while you’re ... by notRobot on Tuesday December 15, 2020 @09:25AM (#25430567)
First search result: https://van.physics.illinois.edu/qa/listing.php?id=14253&t=i...

Consider using search engines in the future.

Re:Ask HN: Is it possible to blow up a balloon while you’re ... by simonblack on Tuesday December 15, 2020 @05:21PM (#25436017)
Depends on the air-pressure in the lungs. If you inflate them from a scuba tank, possibly. If you take a breath and then jump in the water, no.
Re:Ask HN: Is it possible to blow up a balloon while you’re ... by matt_the_bass on Tuesday December 15, 2020 @09:14PM (#25438205)
If on scuba this is trivial. I do it all the time for training.