Assertion: xenon | /r/HasProperty | obtained as byproduct
Facets:
value: from the liquefaction
type: OTHER
value: from separation of air
type: OTHER
Source sentences:
text: It occurs naturally in trace amounts in the atmosphere and is obtained as a byproduct when air is separated into oxygen and nitrogen.
text: xenon is present to a small extent in the atmosphere (less than 1 ppm by volume) and is obtained as a byproduct from the liquefaction and separation of air.