cannot be entered metallic objects in the microwave; this is the first rule that everyone, theoretically, knows. Sparks are supposed to fly and even explode, but the reason may not be so clear to us. That is why the warning that we find in the microwave itself is shocking, indicating the importance of heat liquids with a teaspoon stream inside. And yes, metal ones are included.
This recommendation may appear in a sticker visible when opening the microwave itself, or simply in the instruction manual, that mysterious book that we often ignore or skim over when buying it without paying much attention, getting lost in a drawer. The manuals not only teach us how to use a device, they are also important to know the safety precautions, which are not always as obvious as we think.
Why you can heat a metal spoon but not other metal utensils
The general recommendation not to heat metallic objects in the microwave is due to the fact that this material protects the food from the action of the appliance itself. That is, with a metal bowl we would not be able to heat the food, although it does not have to explode or cause any damage. Depending on the power, time and shape of the object, an arc could occur. The metal reflects microwaves, which, if left on, could damage the appliance.
Plus dangerous it turns out to heat a simple glass or cup with liquids such as water, coffee, tea, juice, broth or a soft drink. It seems paradoxical, but all manufacturers warn it, even giving it more importance than the fact of heating metal or not.
For example, in a Samsung manual we can read:
CAVEAT: Microwave heating of beverages may cause delayed eruptive boiling. Therefore, be careful when handling the container.
We read similar messages from other popular manufacturers such as Candy (“Heating beverages in the microwave may prolong boiling, so care must be taken when handling the container”) or Whirlpool, which also includes more complete instructions, coinciding with Siemens, a brand that He usually adds a sticker to his own devices, in case we don’t read the manual.
The problem, and potential danger, is that liquids can be heated in the microwave above the boiling point without us seeing it, without bubbles coming out. This can cause a sudden overflow when touching or moving it, with the risk of even causing burns of a certain severity.
To avoid this, manufacturers recommend remove first slightly the liquid, leave the spoon inside and warm it up with her, always in the center. Once the appliance has finished, it is advisable to wait a few seconds before carefully stirring again.
And why can the spoon be metallic? Simply because, being covered by the liquid and inside a container of another material, the microwaves they will not ‘bounce’, something that also helps the shape of the spoon itself. As the expert explains Miguel Angel Luruenahaving no protrusions, being the spoon rounded and with no pointed parts (such as a fork), no sparks will occur.
It is also important to ensure that the spoon never touch the walls or ceiling of the appliance, and that the material of the glass or cup is suitable for microwaves. It is also advisable to avoid containers with a narrow neck or mouth or with completely straight walls.
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