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Topic: pressure on object at different depth`s.  (Read 6199 times)

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Offline Morphic flip

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pressure on object at different depth`s.
« on: February 27, 2008, 05:20:28 PM »
If a 1cm round piece of high density foam (slightly porous), was weighted to slightly under neutral bouyancy, took 20 seconds to sink to a depth of say 2 feet at normal atmospheric conditions.
If it was at 10 feet, 15 feet, 20 feet etc. Would it still be as bouyant, less or more bouyant at these increasing depths?
I was thinking along the lines of what depth does water and atmospheric pressure take over affecting bouyancy.

Offline Morphic flip

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Re: pressure on object at different depth`s.
« Reply #1 on: March 04, 2008, 10:16:50 AM »
Anyone got any ideas?

Offline Borek

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Re: pressure on object at different depth`s.
« Reply #2 on: March 04, 2008, 10:36:48 AM »
It'll depend on the foam compressibility.
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Offline Morphic flip

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Re: pressure on object at different depth`s.
« Reply #3 on: March 08, 2008, 02:47:50 PM »
Not very compressable foam.
Or say if something else slightly porous was the subject, it doesn`t have to be foam.
I am curious about the water pressure effect and depth of water in which it has an
effect on items of near neutral bouyancy.
I realise the greater the depth, the more pressure is on a item, but would it be
2 feet, 5 feet, 15 feet etc that it would affect the bouyancy to a noticeable degree.
Like if it was suspended 1 foot of the bottom in depth of 3 feet, what would happen
if depth was 15 feet instead of 3 feet.
Thank`s.

Offline Borek

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Re: pressure on object at different depth`s.
« Reply #4 on: March 08, 2008, 03:22:35 PM »
Looks like you don't understand physics behind. Buoyancy depends on the mass of water displaced by the object, this in turn is volume times water density. You may safely assume water density to be not pressure dependent, but as long as you don't have exact information about the foam behavior under pressure any answer - even 42 - will do.
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