How Does Microwave Oven Work?

Many of us cannot eat food without heating. Fast food like cold pizza, burger cannot be eaten properly if it is not reheated. Microwave ovens are often used in addition to reheating ready-to-eat items. Used to prepare food items. A microwave oven actually cooks with microwaves (very low frequency of radio waves). Percy Spencer was the first to come up with the idea of ​​microwave cooking. He suddenly got this idea. This is an interesting fact which I will mention at the end of the post. Before that let us know which principle of physics works behind the cooking of microwave oven.

We know from physics that increasing the temperature of an object increases its internal energy and the molecules inside it vibrate at a higher rate. Again if its temperature is decreased then its internal energy decreases. As a result, the rate of vibration of the molecule becomes less than before.

From here we understand that the temperature of the object depends on the rate at which the molecules in the medium are moving or vibrating. That is, if the molecules of a solid are stirred in some way at a higher speed than before, then its temperature will increase.

And by doing so the temperature of the food in a microwave oven is raised or heated.

10 millimeter to 30 cm radio waves or radio waves are called microwaves I told in my previous post what is radio wave and how it can be created I also mentioned that radio waves can be generated in different ways And also mentioned a process where radio waves are generated through an LC tank circuit.

But a microwave oven doesn't generate radio waves in that process. Here the thing used to make microwave is called magnetron. In the picture we can see the diagram of magnetron used in oven. The magnetron is made up of two components. A rotating magnet or drum and a high voltage shock wave induction coil.

How Does Microwave Oven Work?

Earlier we have learned that a radio wave is produced by the relative motion between a magnetic field and an electric field. Also know that a moving magnetic field creates an electric field

Here, the magnetron of the oven acts as the rotating magnet electric field, and the induction coil acts as the magnetic field. Where the direction of the magnetic field in the induction coil changes, it is driven by a high voltage shock wave.

This interaction between them produces high energy radio waves and the shock wave frequency of the induction coil and the rotation of the magnet are adjusted in such a way that it usually produces microwaves of the above wavelength. But for ovens, this wavelength is usually around 4.7 inches, or 2.5 GHz.

Interestingly, there is another reason behind the 4.7″ wavelength commonly used in microwave ovens. This is because these wavelengths can usually pass easily through fibrous materials and vibrate as they pass through the fibrous molecules. And this is why a wavelength .

It was about telling the interesting story behind Mr. Spencer's discovery.

Mr. Spencer had a young daughter. As always, the girl wanted to eat chocolate. She was working as an engineer in an institution at that time. So before going home from work, he wants to get chocolates for his daughter. but sometimes he forgets

So one day he was already working on a new technology generator, buying chocolate and putting it in his pants pocket. After work, I don't go back home because the chocolate melted and turned into a different shape, Mr. Spencer discovers the reason. Launched - resulting in today's microwave ovens. You must have understood the reason for this by now. because everything is explained above.