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What does the law of buoyancy mean - Scuba Diving & Snorkeling

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marco scafidi

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The law of buoyancy is the principle that describes why some objects float over water and some others sink: when you put something in water, it receives an upword force equal to the weight of the water it displaces.
this is important in diving in many ways.. and in particular, in diving, you always want to have a neutral buoyancy: this means that if you are standing still in water and you have a neutral buyoancy, you don't sink nor come back to surface

you have a neutral buoyancy if you "displace" always the correct volume of water.. in other words, you always need to occupy about the same volume: if you go in deep water, the water pressure will "reduce" your volume, so to mantain a neutral buoyancy you have to inflate air in your buoyancy compensator jacket to expand its volume.
otherway, if you're coming back to surface, pressure reduces and your body occupies more volume, so you have to deflate your jacket.

Posted on Jul 30, 2017

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