Assertion: unit | /r/HasProperty | believed
Facets:
Source sentences:
text: At the time the A* unit was defined, it was thought to equal 10-10 m (the angstrom unit, Å) to within 5 parts per million, but the A* unit is now believed to be 20 ± 5 parts per million larger than 10-10 m. Special units whose values are obtained experimentally are used in astronomy.