Alabama is seeking to become the first state to execute a prisoner by making him breathe pure nitrogen.
The Alabama attorney general’s office on Friday asked the state Supreme Court to set an execution date for death row inmate Kenneth Eugene Smith, 58. The court filing indicated Alabama plans to put him to death by nitrogen hypoxia, an execution method that is authorized in three states but has never been used.
Nitrogen hypoxia is caused by forcing the inmate to breathe only nitrogen, depriving them of oxygen and causing them to die. Nitrogen makes up 78% of the air inhaled by humans and is harmless when inhaled with oxygen. While proponents of the new method have theorized it would be painless, opponents have likened it to human experimentation.
Nitrogen hypoxia is a risk wherever liquid nitrogen is used. If too much boils too fast, it will displace the oxygen in the room. People in the room won’t even realize what happened until they pass out and die shortly thereafter.
There are reports of people rushing in to rescue those who passed out, and suddenly passing out themselves and needing to be rescued as well. That’s how insidious it is. And that’s why MRI scanners (which use liquid nitrogen) have oxygen sensors in the room. You can’t trust your own body to tell you that all the oxygen is gone.
MRI machines are cooled by liquid helium. Nitrogen is not cold enough. I’d imagine as a noble gas it has a similar effect though.
They are cooled by liquid helium, but also have a liquid nitrogen outer dewar as well with a vacuum insulator in between. The N2 takes the brunt of the ambient heat so you don’t have to top off the (much more expensive) helium as often.