Why should you not put metal in the microwave?

(Dan Tri) - When using a microwave, remember that staying away from metal is always the best option to ensure the device works well and is safe.

Putting metal inside a microwave can damage the device and even cause a fire or explosion (Illustration: Getty).

Accidentally placing metal objects in a microwave oven can cause serious consequences, from damage to the risk of fire or explosion. Experts advise users to pay special attention to avoid unnecessary risks.

Microwaves work by generating electromagnetic waves at a frequency of 2.5GHz through a device called a magnetron. These waves cause electrons to oscillate, creating heat to cook food. However, when metals are placed in the oven, especially those with sharp edges or uneven surfaces, they can become a focus of the electric field.

Because metals are good conductors of electricity, electrons will move strongly on their surfaces. If the electric field is strong enough, it can ionize the surrounding air molecules, resulting in an electric arc and sparks. These sparks can not only damage the furnace walls but can also permanently damage internal components and even cause a fire or explosion.

While some food manufacturers use a thin metal layer under the lid of instant food cans to speed up cooking, this also poses risks if left beyond the recommended cooking time.

Conversely, if the metal layer is too thick, the microwaves will be completely reflected, causing the food to not be able to heat up. This shows that using metal in a microwave is not only dangerous but may also not bring the desired effect.

To ensure safety and prolong the life of the microwave, users need to strictly follow the manufacturer's instructions.

In case of uncertainty, it is best to avoid placing any metal objects in the oven. Understanding the operating principles and potential risks will help users avoid unfortunate incidents and save on unexpected repair costs.

Source: https://dantri.com.vn/khoa-hoc/vi-sao-khong-duoc-cho-kim-loai-vao-lo-vi-song-20250831233801628.htm