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7.
How Your Microwave Oven Works
(Cont.)
The rate of heating depends on the moisture content, shape,
volume and amount of food present. Metallic materials totally
reflect microwaves. Non-metallic materials such as glass, paper and
plastics are partially transparent to microwaves. Microwaves do not
directly heat the oven walls and most cooking utensils because they
do not absorb microwave energy. However, they frequently get very
warm through being in direct contact with hot food.
TMW3504WCAN_IB_18-11-04 11/19/04 5:56 PM Page 7