Assertion: atmospheric pressure | /r/HasProperty | about 30 inches of mercury
Facets:
value: at sea level
type: LOCATION
Source sentences:
text: At sea level, atmospheric pressure is about 30 inches of mercury, and this decreases at a rate of approximately 1 inch for every thousand feet of altitude above sea level, so at an altitude of 4000 feet, the pressure is approximately 26 inches of mercury.