Assertion: helium | /r/HasProperty | supplied on large scale
Facets:
value: from liquefaction of air
type: CAUSE
Source sentences:
text: Some helium is supplied from liquefaction of air on a large scale; the amount of helium obtainable from 1,000 tons (900 metric tons) of air is about 112 cubic feet (3.17 cubic metres), as measured at room temperature and at normal atmospheric pressure.