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I think you don't even need to consider the displacement. It's simply a matter of working out your density compared to water, and multiplying that by your weight. So a 100lb person that's 10% more dense than water would have a weight of 10lb.
Someone with the same density as water would have zero weight, ie, they are neutrally buoyant.
So what's the actual density of a person? According to this article, it's between 1.10 (lean) and 1.05 (obese). Average for a health male appears to be around 1.08, or 8%.
A health 200lb male would therefore weigh 16lb in water. Much less if it's salt water.
-------------------- I know... that just the smallest
part of the world belongs to me
You know... I'm not a blind man
but truth is the hardest thing to see
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