How to do a microwave experiment

Ever wanted to know how microwave ovens work? For this experiment, you will need:
3 identical, microwave safe containers filled with water,,cooking oil, and nothing. Set the time for 15 seconds and start the oven. When the oven stops, open the door and carefully remove all three glasses. Carefully feel the outside of the glass of water, at the water level. The glass of water heated up nicely, but the glass of oil, and the empty glass did not. Why? It has to do with how a microwave oven works. Inside the oven is a tube called a magnetron. This magnetron broadcasts microwave radiation. Oil is not a polar molecule. That is the reason that oil and water do not mix easily. Polar molecules stick to other polar molecules, but not to nonpolar ones. Dry foods do not cook well in the microwave oven.