Hydrostatic pressure acts in all directions, with its direction determined by the relative pressure inside and outside an object. For divers, the pressure is nearly equal inside and outside, preventing a crushing sensation, while a balloon filled with water experiences outward pressure due to higher internal pressure. The discussion clarifies that as a diver descends, the pressure increases, leading to a sensation of being squeezed, which limits snorkeling depth compared to scuba diving, where divers breathe from a pressurized tank.
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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.
The walls will constrain the liquid, yes - otherwise it would break and all the water would pour out.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?
"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.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.