Comments on: What Makes Something Sink or Float?

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By: Bell Diving

Bell Diving — Mon, 23 Aug 2010 23:06:50 +0000

[...] container grows larger, submersion becomes more challenging. As you know from your understanding of buoyancy, the larger an object is, the heavier it has to be to become negatively buoyant and sink. If you [...]

By: David

David — Thu, 17 Jun 2010 15:36:55 +0000

@DSV: Blowing out all your air will make you less buoyant, but whether you sink or not will depend on other factors. It is when the decrease in volume makes you cross from positively to negatively buoyant that breathing out will make you sink.

Fat content does have some effect on buoyancy. It takes up a lot of volume but with relatively low density (compared to muscle). Thus it can increase your buoyancy slightly.

By: DSV

DSV — Thu, 17 Jun 2010 15:31:00 +0000

Can a person weigh negative(become floatable) under water after blowing out all the air??? If yes is it because of fat content??