Assertion: methane's concentration | /r/HasProperty | 21%
Facets:
value: by volume
type: OTHER
Source sentences:
text: The normal concentration of oxygen is 21% (by volume) or 23% (by weight) so this seems a rather small diminution, given that people can survive easily enough at altitudes where the atmospheric pressure is half normal, and I thought that the key issue was that for breathing to keep you alive you need the partial pressure of O2 in the air to be higher than the equilibrium partial pressure over a haemoglobin solution, thus the benefit of breathing pure oxygen at low pressure.
text: Our lungs are programmed to function normally when the atmospheric concentration of oxygen is 21 percent, but when the same comes down as a result of the presence of methane in the surroundings, it can trigger asphyxiation i.e. the condition of being deprived of oxygen, and even result in the death.