- #1
fog37
- 1,568
- 108
Hello Forum,
Humans breath by inhaling and exhaling air at 1 atm of pressure (which is ~15lbs/in^2). Air pushes from the outside on every inch of our body with a force of 15lbs but an equal force is pushing from the inside. The net force is zero.
The water pressure increases linearly with depth (1 extra atm every 10 meters). As far as divers go, why do scuba tanks need to supply air at the same pressure as the external underwater ambient pressure? During the inhaling phase, muscles contract (diaphragm, intercostal muscles) and the lungs expand causing the air pressure inside them to decrease an become less than the external pressure. That automatically forces air inside the lungs.
What is the a problem if the compressed air supplied by the scuba tank is at a higher pressure than the ambient water pressure at that depth?
What is the problem breathing with a long snorkel tube which is connected to the outside air where the pressure is 1 atm? Why are the inhaling and exhaling very difficult? I am not sure I understand why the high water pressure at a certain depth pushes "too hard" on the body for the muscles to contract. The ambient and internal body pressure should always equalize otherwise the body would collapse...
thanks,
fog37
Humans breath by inhaling and exhaling air at 1 atm of pressure (which is ~15lbs/in^2). Air pushes from the outside on every inch of our body with a force of 15lbs but an equal force is pushing from the inside. The net force is zero.
The water pressure increases linearly with depth (1 extra atm every 10 meters). As far as divers go, why do scuba tanks need to supply air at the same pressure as the external underwater ambient pressure? During the inhaling phase, muscles contract (diaphragm, intercostal muscles) and the lungs expand causing the air pressure inside them to decrease an become less than the external pressure. That automatically forces air inside the lungs.
What is the a problem if the compressed air supplied by the scuba tank is at a higher pressure than the ambient water pressure at that depth?
What is the problem breathing with a long snorkel tube which is connected to the outside air where the pressure is 1 atm? Why are the inhaling and exhaling very difficult? I am not sure I understand why the high water pressure at a certain depth pushes "too hard" on the body for the muscles to contract. The ambient and internal body pressure should always equalize otherwise the body would collapse...
thanks,
fog37