Hydrostatic Pressure: Radial Inwards vs Outwards

In summary, the conversation discusses hydrostatic pressure and how it can act radially inwards or outwards depending on the situation. The example of a diver feeling pressure from the water acting inwards is given, while a balloon filled with water experiences pressure acting outwards. The pressure inside an object submerged in a jug of water is also discussed, with the walls of the jug containing the liquid. The conversation also touches on the difference between snorkeling and scuba diving, with the latter allowing for easier breathing due to the use of a pressurized container.
  • #1
Freddy86
17
0
Hydrostatic pressure is exerted in all directions but what determines whether it acts radially inwards or radially outwards. For example, if you are a diver you feel pressure from the water acting inwards, giving you a crushing sensation. However, if you fill a balloon full of water and poke holes in it, the pressure acts radially outwards?
 
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  • #2
Divers do not get a crushing sensation. That would be awful and no one would want to do it!

The pressure pushes a balloon out because there is a higher pressure inside than outside.
 
  • #3
If the pressure is larger inside, the net force will be outwards. If the pressure is larger outside, the net force will be inwards. In the case of a diver the forces are equal (just about) with no net force.
 
  • #4
russ_watters said:
Divers do not get a crushing sensation. That would be awful and no one would want to do it!

The pressure pushes a balloon out because there is a higher pressure inside than outside.


Thanks for the replies. So if you submerge an object in a jug of water then the pressure will be radially inwards on this object right? Is this because the walls of the jug are considered to be at greater pressure than the fluid then?

No I meant that if a diver went down too deep they get a sense of being squeezed (maybe crush is too drastic). I thought this was why the depth of snorkeling is limited as the deeper you go the more your chest gets squeezed so at a particular depth you cannot expand your diaphragm anymore and are thus are unable to breath.
 
  • #5
You cannot snorkel very deep because you breath out of the air above which is indeed at a lower pressure, but you can scuba because then you breath out of a pressurized container. You didn't specify which one you're talking about.
 
  • #6
Freddy86 said:
Thanks for the replies. So if you submerge an object in a jug of water then the pressure will be radially inwards on this object right? Is this because the walls of the jug are considered to be at greater pressure than the fluid then?
The walls will constrain the liquid, yes - otherwise it would break and all the water would pour out.
No I meant that if a diver went down too deep they get a sense of being squeezed (maybe crush is too drastic). I thought this was why the depth of snorkeling is limited as the deeper you go the more your chest gets squeezed so at a particular depth you cannot expand your diaphragm anymore and are thus are unable to breath.
"Diving" typically means scuba diving. It isn't the same as snorkeling. dauto is right; for snorkeling, you have to fight the water pressure to breathe (as does your snorkel - if it isn't rigid it will collapse). But for scuba diving, you don't.
 

FAQ: Hydrostatic Pressure: Radial Inwards vs Outwards

What is hydrostatic pressure?

Hydrostatic pressure is the pressure exerted by a fluid at rest. It is the force per unit area exerted by the weight of the fluid due to the Earth's gravity.

How does hydrostatic pressure affect objects?

Hydrostatic pressure can compress, deform, or displace objects that are submerged in a fluid. It also plays a crucial role in the movement of fluids within a closed system.

What is the difference between radial inwards and outwards hydrostatic pressure?

Radial inwards hydrostatic pressure refers to the pressure exerted by a fluid towards the center of a container or object. Radial outwards hydrostatic pressure, on the other hand, is the pressure exerted by a fluid away from the center of a container or object.

How is hydrostatic pressure calculated?

Hydrostatic pressure is calculated by multiplying the density of the fluid by the acceleration due to gravity and the depth of the fluid. It can be expressed as P = ρgh, where P is the hydrostatic pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the depth of the fluid.

What are some real-life applications of hydrostatic pressure?

Hydrostatic pressure is used in many industries, including plumbing, hydraulics, and engineering. It is also essential in understanding the behavior of fluids in natural systems, such as oceans and lakes. In addition, hydrostatic pressure is a crucial factor in scuba diving and other underwater activities.

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