Iv'e got this one

Microwaves work by exciting resonances in water molecules, and the water, once excited, heats up everything else in the frozen dinner you're cooking. Since water is an asymmetric triatomic molecule, it has three distinct rotational modes and three more vibrational modes, making it easy to find resonances. Nitrogen, on the other hand, is a symmetric diatomic molecule, so it only has one distinct rotational mode and one vibrational mode. That makes it much harder to match a resonance for nitrogen, so the microwave probably wouldn't do anything to it.

On the other hand it might.

Posted By: mike_the_sphinx, Oct 26, 15:05:34