- #1
Another God
Staff Emeritus
Gold Member
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I'm curious about some fluid dynamics stuff, and my first series of questions I have are to do with how air rises out of water...
Having done some scuba diving, I know that divers use bladders to achieve neutral bouyancy and positive bouyancy so as to hover or rise through the water.
Now for the questions: What sort of upward force is exerted by air under water?
Take a cubic meter of air for the sake of ease. Is it the inverted equivalent of 1 cubic meter of water being tipped out of a bucket? ie: mass = 1kg, acceleration = 9.8m/s/s? (of course, the 'air resistance' would be very different to the 'water resistance') Or is it different because of the fact that the bubble is going 'up'?
I do realize that the 'upward force' being exerted by the air in the divers bladder is a consequence of the water displacement, but can someone more accurately explain how that works? How does the displaced water 'push the air up?' instead of ...well...pushing down more.
Having done some scuba diving, I know that divers use bladders to achieve neutral bouyancy and positive bouyancy so as to hover or rise through the water.
Now for the questions: What sort of upward force is exerted by air under water?
Take a cubic meter of air for the sake of ease. Is it the inverted equivalent of 1 cubic meter of water being tipped out of a bucket? ie: mass = 1kg, acceleration = 9.8m/s/s? (of course, the 'air resistance' would be very different to the 'water resistance') Or is it different because of the fact that the bubble is going 'up'?
I do realize that the 'upward force' being exerted by the air in the divers bladder is a consequence of the water displacement, but can someone more accurately explain how that works? How does the displaced water 'push the air up?' instead of ...well...pushing down more.
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