pressure of diving?

Question

People claim that after you have scuba-diving, you have to come up in the water to water surface slowly, can anyone explians that to me ?

Answer 1

air pressure decreases with altitude and water pressure increases with depth.
because water is denser than air, pressure increases more rapidly as you descend.
Know that the human body is mostly water, and that in recreational diving, water pressure will be felt in the air spaces of the body (lungs, sinuses and ear canals).
The air pressure at sea level is defined as one atmosphere of pressure (1 ATM).
Know that pressure increases at the rate of 1 ATM every 33 feet of water depth. A diver at 33 feet of depth is at 2 ATM, 3 ATM at 66 feet, and so on.
Understand that air volume in a flexible space (such as your lungs and sinuses) is reduced proportionate to pressure. At 2 ATM the volume is halved, at 3 ATM it is a third of surface volume, and so on.
Know that air density (such as in your lungs and scuba tank) is proportionate to pressure. At 2 ATM the density is doubled, at 3 ATM it is tripled.
Realize that air within an air space will expand proportionally as pressure is reduced. For example, moving from 2 ATM to 1 ATM (33 feet underwater to the surface), air in a closed container will double. Keep this in mind when surfacing.


1 The body will float if the buoyancy is positive
(body weight < weight of displaced liquid).
2 The body will be suspended if the buoyancy is neutral
(body weight = weight of displaced liquid).
3 The body will sink if the buoyancy is negative
(body weight > weight of displaced liquid).

Answer 2

During a dive, increased pressure causes nitrogen from the air to dissolve in body tissues. The amount depends on how deep and how long you dive. The deeper and longer, the more excess nitrogen the body absorbs.

When ascending, the pressure decreases and excess nitrogen cannot stay dissolved in the body and begins to come out of solution. Since the body does not use nitrogen, it has to leave the body as it comes out of solution.

Maintaining a reasonable level of nitrogen, the body can eliminate it without complication. Rising too fast causes the nitrogen to form bubbles in the blood vessels and body tissue.

The limits for mandatory safety stops to prevent DCI (Decompression Illness) and DCS (Decompression Sickness) for recreational diving is 30 meters/(00 Feet), or if you exceed the allowable time based on diving tables for any certain depth.

The speed of ascent is recommended to be no faster than 18meters(60 feet) per minute.

Answer 3

Every 33 ft you go down the pressure in your body will equalize to that pressure. If u come up too fast the nitrogen will bubble out of your body causing much pain. Do not try to dive with oxygen as under increased pressure it will make u drunk,and anything is possible. I have Sean a diver that offered his air to a fish. If u are over 33 ft. it is very dangerous as u cant come up without depressurization.

Answer 4

It has to do with the nitrogen in the air. At normal presuure, Nitrogen does not dissolve into the bloodstream. At high pressure underwater, nitrogen starts to disolve into the blood. If you come up too fast the nitrogen will turn to bubbles in your blood, like CO2 in soda when you open the bottle. This is called the bends. Comming up slowly lets the nitrogen be exhaled from your lungs before this happens.

Common missconception is that divers breathe pure oxygen. They cannot. At high pressure pure oxygen will become toxic. For deep=long duration dives the nitrogen in the air is replaced with helium, which will not desolve in the blood at any pressure.

Answer 5

As you dive deep, the air your breath is very compressed and at greater pressures, Nitrogen migrates into your blood. If to much get in there and you come up fast, the gas is released from your blood and will give you the bends. So after a deep dive, you come up slow allowing the Nitrogen to leave your blood safely.

Answer 6

it depends on how deep you dive and how long you stay down

down to I believe 33 feet it's not a problem deeper than that you need to know how deep and how long you are down so you can come back to that level and wait until the nitrogen in your blood stream clears before surfacing so you dont develop the bends ( nitrogen bubbles)

Answer 7

this pertains to deep sea diving mostly, once you have gone deep enough and your body adjusts to the pressures at deep water you need to ascend slowly and even stop at certain levels to allow your body to decrompress, if you dont do this you get something called "the bends" which is your own internal body pressure crushing on your internal organs

Answer 8

you will get the bends