Understanding the Direction of Pressure in Air and Water Environments

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Discussion Overview

The discussion revolves around the nature of pressure experienced by a person swimming out from a submarine at the bottom of the ocean. Participants explore how pressure is exerted in fluid environments, particularly focusing on whether it is exerted from all directions or primarily from above, and the implications of fluid weight on pressure perception.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that pressure is exerted from all directions, suggesting that the surrounding water applies force equally from the sides as well as from above.
  • Others argue that the pressure is primarily due to the weight of the fluid above, leading to the belief that pressure is mainly exerted from the top.
  • A participant mentions that while pressure is exerted from all sides, the pressure beneath is slightly higher, resulting in a net upward force in addition to the crushing force.
  • Another participant highlights that the water below must support the weight of the water above, implying that pressure dynamics are influenced by the surrounding fluid columns.

Areas of Agreement / Disagreement

Participants express differing views on the nature of pressure in fluid environments. While there is some agreement that pressure is exerted from all directions, the extent and implications of this pressure remain contested.

Contextual Notes

Participants reference the concept of pressure in fluids but do not fully resolve the nuances of how pressure is distributed in three-dimensional space, nor do they clarify the mathematical relationships involved.

False Prophet
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If you're on a submarine at the bottom of the ocean and you swim out, do you get crushed from all around, or just from the top? I read in a couple places that the pressure is exerted from all directions, but I thought that the pressure is like the "weight" of all the fluid stacked above you. I don't know; please advise.
 
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There is also the weight of the columns of water above the water beside you. The water on your left and on your right will try to move out from under the columns above them by crushing you.
 
False Prophet said:
If you're on a submarine at the bottom of the ocean and you swim out, do you get crushed from all around, or just from the top?
You'll get crushed from all sides. But since the pressure is a bit higher underneath you, you will be pushed more by the water underneath you. The water pressure, in addition to crushing you, will exert a net upward force on you.
 
False Prophet said:
If you're on a submarine at the bottom of the ocean and you swim out, do you get crushed from all around, or just from the top? I read in a couple places that the pressure is exerted from all directions, but I thought that the pressure is like the "weight" of all the fluid stacked above you. I don't know; please advise.

Yes, this confused me too, but remember that the water below you has to support this "column weight". So as Doc Al said, the pressure below you is even higher than the pressure above.
 

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