Assertion: endosperm | /r/HasProperty | heated
Facets:
Source sentences:
text: Popcorn pops because the pericarp is strong enough to hold in the steam created when the endosperm, which is 14.5 percent water, is heated — strong enough, that is, until the steam reaches 177 degrees C. and the pressure builds to 9.5 kilograms per square centimeter.