Is it an effective CTB method to put liquid nitrogen bottles (or liquid argon bottles, if that's possible) in a small closed room and release the nitrogen (e.g. a closed telephone booth)? I think it'd reach the effect of charcoal method..
Scenario 1: With liquid nitrogen
Since diatomic nitrogen is lighter than air, it will have a tendency to float to the top. Within an enclosed area -- like a telephone booth -- liquid nitrogen will evaporate. At which point, the person in the booth would fall down and most likely be crouching near the base of the booth. But at the bottom of the booth, there is air so the individual will be awoken. After a prolonged period of time and the oxygen in the air is depleted, CO2 will permeate the bottom and the person would suffocate and expire. (Suffocation: ~1hr)
Scenario 2: With liquid argon
Argon is monatomic and is heavier than air. Presuming it completely vaporizes, argon would descend to the base of the telephone booth. Though it will be very chilly, the individual will still be standing breathing air. Upon depletion of oxygen in the air, the person would fall and most likely be in a crouching position where argon dominates. Soon thereafter, the individual would succumb to the hypoxic effects of argon. (Hypoxia: ~1hr)
Clearly neither is efficient, however, argon would appear to be less painful. Neither is peaceful IMO.
