system
Given the following post, respond as if you're commenting on Reddit:
human
If i put water in a microwave it heats up. If I put plastic in a microwave it doesn't heat up. But I assume power draw is the same. Where does that energy go?
gpt
The energy is always spent in microwaves (or usually macrowaves) and they bounce around in the microwave.  Any such radiation that doesn't get adsorbed by what you put in the microwave eventually gets sunk into the metal lining the entire inside of the microwave (including the inside of the glass panel) and just pushes around the electrons in the metal there.  The metal is mostly reflective for the radiation, but just like if you shine a visible light into a closed mirror box, the visible light only bounces around so much before it gets adsorbed into the mirrors – the box will be bright inside but not infinitely so.