Assertion: little ammonia | /r/HasProperty | left in the bottle
Facets:
value: in order to prevent air
type: PURPOSE
Source sentences:
text: Since ammonia dissolves rapidly and thoroughly in water, in order to prevent air from going into ammonia containers, a little ammonia should be left in the bottle: that is to say, the pressure meter should remain at 0.05 MPa (0.5 atmospheres pressure).