Assertion: methane's concentration | /r/HasProperty | above 6.7%
Facets:
value: in air
type: LOCATION
Source sentences:
text: Since methanol vapor is heavier than air, it will linger close to the ground or in a pit unless there is good ventilation, and if the concentration of methanol is above 6.7% in air it can be lit by a spark and will explode above 54 F / 12 C.