Methane is also an asphyxiant and may displace oxygen in an enclosed space.
SA Materials that are simple asphyxiant gases: nitrogen, helium, neon, argon, krypton, and xenon.
Antonyms
Propane affects the central nervous system at high concentrations and is an asphyxiant.
Natural gas, by displacing oxygen, acts as a simple asphyxiant (DB21, p.
