swimming

The swim test. The dreaded swim test. Historically speaking, the swim test is a source of anxiety for many divers new to GUE. And it makes sense: most people have swim-for-leisure experience, not swim-for-exercise experience; recreational agencies typically have low-rigor requirements...

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I made a video about the physics of fish swimming - for small fish, viscosity dominates the movement of fish through water, for large fish, it's inertia. I discuss Ed Purcell's classic paper "Life at low Reynolds numbers". I hope this is educational. Enjoy!