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Originally Posted by ahecht
It's not really an issue of lightweight water. In order for the fish to not float to the top or sink to the bottom, it adjusts its swim bladder so that is exactly the same density as the water around it. If the fish were heavier than the water, it would sink.
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The thought behind the lightweight water is that the fish would be able to make more of a difference in weight if the water didn't weight as much.
As for the human bubble- that would be kinda fun, provided you have enough air and the bubble never broke.
_Alex
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