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How Does a Microwave Oven Work?


How Does a Microwave Oven Work?

Source of pictures: Pixabay.com

It's a busy day and Mom would have lunch outside. Before going out, she told Daniel that his lunch was in the refrigerator. He had to heat it up in the microwave oven before eating, and she had written him a note. Daniel nodded his head vigorously to reassure Mom.

The morning passed quickly, Daniel touched his hungry stomach and went to the kitchen, to see what Mom had prepared for him. There was a small bowl of rice left over from yesterday in the refrigerator. He saw the sticky note on the refrigerator door left by Mom, and put the rice in the microwave oven according to the steps the note suggested. He set the time and closed the door of the microwave oven, and then went to the living room with washed grapes in hand.

After a while, he heard the ding of the microwave oven and took out a bowl of hot rice with protective gloves. How efficient the microwave oven was. He thought it's amazing that it could heat up food so quickly even without fire.

When Mom came home in the evening, Daniel lay on the couch and said feebly, "Mom, I am starving."

Mom felt funny at Daniel's puppy-dog eyes and poor look and took a bag of food to the kitchen. Then she asked, "Did you have lunch?"

Hearing this, Daniel sat up immediately and said, "I ate some rice. But it's not delicious so I didn't eat them all."

Mom opened the refrigerator and yelled, "I left you a breakfast sandwich. Why didn't you eat it?"

Daniel jumped off the couch and said, "I didn't see it. I just saw a bowl of rice in the refrigerator."

Mom shook her head dotingly.

Daniel came in the kitchen and shook mom's hand and asked, “Mom, why can the microwave oven heat food without fire?"

Mother answered while tidying up the stuff in the refrigerator, "Microwave ovens use microwaves to heat food instead of fire. Microwaves are a form of electromagnetic wave with wavelengths ranging from 0.1 mm to 1 m. They could make some of the molecules in food, especially water molecules, to vibrate; then the vibrations and collisions between the molecules bring heat energy, which makes the food hot."

Daniel had never thought of a heating method like this before, and suddenly felt the microwave oven was amazing.

He raised his head and asked, "We're also made of molecules. Will microwaves affect our body in a similar way?"

Mom nodded and said, "It will. But microwave ovens' shells are made of metal, which can reflect the microwaves and keep them inside the box. If used properly, microwave ovens will not do harm to our bodies."

Daniel thought that thankfully, he operated the microwave oven according to the note Mom had left, or he wouldn't even know if he was microwaved. 

Author: Huang Jing

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