Popcorn Assignment

Radiation is the only way heat can move through relative empty space. Other ways of heat needs molecules to move like air or water to move the heat. Most of the radiation comes from the Sun, good absorbers of radiation are good radiators also. The door to a microwave is made especially made so that it can reflect micro waves so that they cant escape. Metal surfaces reflect microwaves and the little mesh holes lets you look at your food while its cooking kind of like a mirror for microwaves. Currents that are electric flow through the mesh made of metal as the microwaves hit it and those currents bounce off and reflect in a different direction. Since the holes aren't big enough to interrupt the current flow, the mesh reflects the microwaves as good as a solid metal surface would.