Gravity will exert an opposite (downward) force equal to the object’s weight, so if the object weighs less than 62.4 pounds it will float. A cubic foot of fresh water weighs 62.4 pounds, so an object with a volume of 1 cubic foot would experience 62.4 pounds of upward force due to buoyancy when immersed in fresh water. So salt water weighs 2.5% more than the same volume (a gallon or litre, for example) of fresh water.īuoyancy is an upward force equal to the weight of water displaced by the object. By how much? The salinity (saltiness) of the ocean varies, but the generally accepted average amount is 2.5%. Why is salt water denser than fresh? Because salt is denser than water and so if you add it to water the resulting solution is denser than pure water. The answer is fundamentally simple – objects (including divers) are more buoyant in salt water than in fresh water because salt water is denser than fresh water. Why salt water is more buoyant than fresh Why is bouancy more in salt water than fresh Which is more buoyant fresh or salt water Here are some of the searches on the topic that have found their way to my blog: Anyway, I’m going to attempt to write something clear on the subject. Tags: Buoyancy, Dive Training, Divemaster, Diving, Diving Physics, Fresh Water, Salt Water, SCUBA, Scuba Calculations, Scuba Diving, Scuba Instructor, Scuba Training, Sea Water, TrainingĪpparently this is a great source of confusion – or perhaps my previous writings about the subject have attracted many searches, and so biases my view of what divers are interested in. Fresh Water FebruPosted by Chris Sullivan in Training.
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