My Grade 7 son is designing a solar oven to melt s'mores for his school homework. We made one out of the medium-sized pizza box with aluminum foil, plastic wrap and construction paper (materials were limited to these). We left the pizza box oven indoor, next to a window, with full sunlight for 4.5 hours. The chocolate part melted easily, but the marshmallow turned hard and dry. Was the oven not hot enough to melt the marshmallow? (Unfortunately, I don't have a thermometer to check the temp inside the box.) Marshmallows used were store-bought, big and new, and we tried it with a whole and a halved marshmallow. It's March here in Toronto.

  • $\begingroup$ This question is off topic for this site. If your windows are newish (within the past 15-20 years) they are probably coated with an infrared-reflective coating. Try it with the oven outside. $\endgroup$ – Asher Mar 19 '18 at 19:04
  • $\begingroup$ Sorry, didn't realize this was off-topic, but thank you for the reply. Yes, you are probably right that the windows are coated. $\endgroup$ – Yayeen Gavieres Mar 21 '18 at 10:23

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