Assertion: projectile's effect | /r/HasProperty | to produce compressed gas
Facets:
value: highly
type: DEGREE
value: in a very short time
type: TEMPORAL
value: behind the cannonball
type: LOCATION
Source sentences:
text: When gunpowder explodes, it increases in volume about 4000 times at normal pressure, so the effect is to produce a highly compressed gas behind the cannonball in a very short time.