what is the effect of increased waterdepth on a scuba diver?

Answer 1

When liquid is under pressure, it is able to hold dissolved gasses. The higher the pressure, the more gasses the liquid can hold. This is just like a bottle of soda.
A diver has the weight of the water above above them, pressurizing their body and the fluids in it. At 33 feet below the water, the pressure is double that of the air at sea level or 2 atmospheres. Every 33 feet further is an additional atmosphere. At 132 feet the weight of the water is four times that of the surface.
A diver breathes compressed air from their tank, and while under pressure some of that air (mostly Nitrogen) has dissolved into their blood, just like and unopened soda bottle has CO2 dissolved in it. When returning to the surface, a diver must ascend slowly, so to allow the gas to leave their body, compare to opening a soda bottle slowly. If a diver ascends too quickly, bubbles can form in the blood and body. This condition is known as "the bends" and can be very painful.

Answer 2

Nitrogen is dissolved into the bloodstream more as depth increases. This is why dives must be planned out as far as length and depth. The "bends" is accually when a diver rises from depth the nitrogen that was dissolved in the blood releases. Just like opening a bottle of soda.. pressure is realeased and the soda fizzes.... the exact same thing can potentially hapen to scuba divers.

Answer 3

Atmospehic pressure...

Answer 4

http://entertainment.howstuffworks.com/scuba1.htm
http://en.wikipedia.org/wiki/Scuba_diving