Assertion: heavy metal | /r/ObjectUse | used for ballast
Facets:
value: in mechanical engineering
type: OTHER
value: in aeroplanes
type: LOCATION
value: in motor vehicles
type: LOCATION
value: in boats
type: LOCATION
Source sentences:
text: In mechanical engineering, heavy metals are used for ballast in boats, aeroplanes, and motor vehicles; or in balance weights on wheels and crankshafts, gyroscopes, and propellers, and centrifugal clutches, in situations requiring maximum weight in minimum space (for example in watch movements).