Assertion: vortex ring | /r/HasProperty | formed
Facets:
Source sentences:
text: One way a vortex ring may be formed is by injecting a compact mass of fast moving fluid (A) into a mass of stationary fluid (B) (which may be the same fluid).
text: A vortex ring is also formed when a mass of fluid is impulsively pushed from an enclosed space through a narrow opening.