Assertion: hydrogen fluoride's amount | /r/CapableOf | decrease to the air density
Facets:
value: proportionally
type: MANNER
value: for higher temperatures
type: PURPOSE
value: for higher altitudes
type: OTHER
Source sentences:
text: For higher altitudes, or higher temperatures, the amount of lift will decrease proportionally to the air density, but the ratio of the lifting capability of hydrogen to that of helium will remain the same.