Back in the days when I was in the Air Force had to service the B-52's with liquid oxygen. Wore protective clothing and a huge mask. Liquid oxygen temperature is minus 296 degrees (-296). Seen a demonstration where a strip of runner was placed in the liquid and quickly removed. When dropped on the ground, it shattered into hundreds of small pieces. You respected the gas. The gaseous oxygen supplied oxygen to the flight crew flying at high altitudes when needed. I don't know if commercial aircraft has the same set up. Been in the Altitude Chamber for flying status and at 40,000 feet (unpressurized) removed our oxygen masks to experience hypoxemia symptoms. Within 10 seconds you experience nothing, human breathing system stopped it was peaceful. Mask back on by a partner and life resumed. They had a surgical glove hanging that was normal. At 40,000 it looked like a balloon. Good way to test teeth fillings, if air in them, could pop the fillings as was told.
Back in the days when I was in the Air Force had to service the B-52's with liquid oxygen. Wore protective clothing and a huge mask. Liquid oxygen temperature is minus 296 degrees (-296). Seen a demonstration where a strip of runner was placed in the liquid and quickly removed. When dropped on the ground, it shattered into hundreds of small pieces. You respected the gas. The gaseous oxygen supplied oxygen to the flight crew flying at high altitudes when needed. I don't know if commercial aircraft has the same set up. Been in the Altitude Chamber for flying status and at 40,000 feet (unpressurized) removed our oxygen masks to experience hypoxemia symptoms. Within 10 seconds you experience nothing, human breathing system stopped it was peaceful. Mask back on by a partner and life resumed. They had a surgical glove hanging that was normal. At 40,000 it looked like a balloon. Good way to test teeth fillings, if air in them, could pop the fillings as was told.