Explain how microwave ovens work.
They use radiowaves to vibrate the bonds of H2O molecules. If she wants to understand that deeper, then think of it kinda like a tuning fork, when struck they vibrate, but a tuning fork will also vibrate if it is near a sounds that resonates with it. Thats what is happening to the water, and vibrations cause heat.
Those holes on the microwave door are the right size so that microwaves cant fit through them, if she is scared of getting radiation, it is advisable to turn on and then move a few feet away, even if the microwaves leak out a bit, they wont go very far.
The food wont change besides being cooked. Are raw green beans better than steamed green beans for you? It may change the nutrition components slightly, but not in a bad way for your health.
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