Why cant scuba divers come up to the surface too fast?

Answer 1

AnswerScuba Divers cannot rise from the water too fast because if they come up too fast they get that feeling like when you are on a roller coaster and you go over a hill really fast and they could die from that because the pressure is much greater

WRONG if a Scuba diver comes up too fast their body fills with a deadly amount of nitrogen which then makes the blood boil, therefor can cause death.

CORRECT ANSWER:

A diver while under water breathes a higher percentage of Nitrogen than he does on the surface. As he come up this nitrogen expands (boyles law) and if you dont come up nice and slowly (which allows you to just breathe out the excess) it can form bubbles in the blood which cause Decompression Sickness (the bends). Imagine a bottle of soda if you shake it the gas expands in the solution. If you open the bottle slowly the gas escapes without any real problem, however if you open the bottle quickly the soda will bubble everywhere - this is the same basic principle.

Answer 2

When coming up the air in your lungs expand, so u can't overexpand them so you come up slowly. Also the nitrogen in your skin has to come out. (decompression)