Assertion: pure oxygen | /r/HasProperty | transformed into ozone
Facets:
value: by a silent electrical discharge
type: CAUSE
value: partly
type: DEGREE
Source sentences:
text: Pure oxygen is partly transformed into ozone by a silent electrical discharge; the reaction is also brought about by absorption of ultraviolet light of wavelengths around 250 nanometres (nm, the nanometre, equal to 10−9 metre); occurrence of this process in the upper atmosphere removes radiation that would be harmful to life on the surface of the Earth.