Im obviously confused somewhere. But let me explain further.
You have a metal container, carrying your breathable gas mix (depending on your depth). If this container doesn’t actually physically compress further due to the rigidity of the metal at say 800ft, then why would breathing a 80-20 mix of Ni and O in a compressed container cause any effects?
I understand that free diving, or diving in mailable suits will obviously cause your body to compress under the weight of the water around you. But saturation divers are very different. Are they not safe from the ‘physical’ pressure of the water, yet unsafe from the compression of air? What is the difference between our bodies not compressing at this depth, compared to the oxygen in our lungs compressing?
Edit: another question. If the oxygen inside the container is already at an extreme pressure, then why would releasing it cause any change to us physically from breathing it at sea level, compared to 1mile under the sea?
In: 13
It’s not the fact that the air tank doesn’t compress, it’s that your body *does.* Your body is not rigid metal so it compresses as water pressure increase. The result of this is that the air tank has to deliver air to your body at the ambient water pressure to keep the balance between your body and the water pressure. In other words, when you’re at a depth of 10m (33 feet), where the water pressure is 2 atmospheres (2x sea level pressure) the air you’re breathing from the tank is *also* at 2 atmospheres – it has to be.
Since both nitrogen and oxygen become toxic at higher pressures, once you start getting to depths at which those gases become toxic at the ambient pressure, you have to start using different breathing gas combinations. Typically this means removing some or all of the nitrogen and replacing it with another gas like helium and also adjusting the ratio of oxygen.
Latest Answers