Assertion: potassium nitrate's property | /r/HasProperty | increased by the addition of nitre
Facets:
value: the reason being
type: CAUSE
value: much
type: DEGREE
Source sentences:
text: It appears that by the eleventh century the Chinese were aware that the incendiary properties of such mixtures could be much increased by the addition of nitre, the reason being that when it is heated this substance yields oxygen.