I can only float on my back if I take and hold a full breath. I assumed it was because I have more muscle than fat but reading about people with high bone density I am wondering if I am right.

closed as off-topic by Kate Gregory, Carey Gregory, Chris Rogers, DoctorWhom, LangLangC Aug 11 at 16:33

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  • 4
    I'm voting to close this question as off-topic because it's not related to health. Biology maybe? – Kate Gregory Aug 10 at 2:37
  • As I'm wondering if it is an indicator of low body fat I would argue it is health related. – Colin Ellis Aug 10 at 7:10
  • Just because it might be an indicator of body fat doesn't make it health related. There is no question about health here. – Carey Gregory Aug 10 at 14:09
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    Try physics stack exchange. We humans have about the density of water. I would guess that breathing in air gives you something called "added mass" which makes your body more dense than water, and you would sink while the water around you rises. I'm not entirely sure though. – Jalapeno Nachos Aug 10 at 20:21
  • @JalapenoNachos The air spaces in our body lower the overall density enough so that we float. If allowed to float naturally, the areas with air (the chest) tends to float close to the surface while the dense legs tend to sink. If you’re unable to float without holding your breath, it’s just due to variations in your own density. You would still float at the surface without breath holding but your mouth might be just under the water :) – Chris Aug 12 at 19:15

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