|MLA Citation:||Bloomfield, Louis A. "Question 324"|
How Everything Works 19 Jan 2018. 19 Jan 2018 <http://howeverythingworks.org/print1.php?QNum=324>.
Concerning the second issue, many plastics melt or soften below the temperature of boiling water. Polystyrene, the plastic from which Styrofoam is made, has a glass transition temperature of almost exactly 212° Fahrenheit (100° Celsius). That means that it will begin to soften at just about the temperature of boiling water. While pure water will boil without much problem in Styrofoam, water containing dissolved solids such as sugar or salt will boil at a higher temperature and may melt the Styrofoam. You'll know when this happens...it's not really a health issue, just a potential for a messy oven. I've only encountered the problem once myself, when a Polystyrene gravy separator melted in the microwave and let the gravy spill.