What is the highest pressure humans can live in in comfort?

The change in pressure below the ocean is approximately $$\frac{dp}{dz}=\frac{1\text{ atm}}{10\text{ m}}$$ where $z$ is measured from the surface of the water downwards. We also have to add in the one atmosphere of pressure from the atmosphere, meaning that the pressure is really $$p(z)=1+\frac{1}{10}z$$ where $p$ is in atmospheres. According to Wikipedia, 100 meters under the surface leads to pressures dangerous to even the most experienced divers. We know that $p(100)=11\text{ atm}$, where nitrogen narcosis becomes extremely hazardous, and could lead to death. A much better depth, in terms of narcosis, is about 40 meters, where $p(40)=5\text{ atm}$.

That said, there's no reason for your city to have the same pressure as the outside ocean. It should absolutely be pressurized, with the correct mix of gases. Pure oxygen can lead to oxygen toxicity.

posted over 8 years ago

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