Assertion: radon | /r/HasProperty | cooled below its freezing point
Facets:
Source sentences:
text: When it is cooled below its freezing point it displays a brilliant phosphorescence.
text: When cooled below the freezing point, radon exhibits a brilliant phosphorescence which becomes yellow as the temperature is lowered and orange-red at the temperature of liquid air.
text: Radon has the interesting characteristic of glowing brightly when it is cooled below its freezing point.