Assertion: helium | /r/HasProperty | absent
Facets:
Source sentences:
text: It affects this by causing a change to a monoclinic ordered state at a lower pressure (around 4 GPa) than if helium were absent.
text: As in Newtonian mechanics, no system that consists of more than two particles can be solved with an exact analytical mathematical approach (see 3-body problem) and helium is no exception.