It is well known that the introduction of metal into the microwave can cause sparks, but, as explained by scientific communicator David Ballesteros “not all metals behave the same way. “The shapes and types of metals make a big difference in how they interact with microwaves. Rounded surfaces, like a spoon, are safer than sharp objects, like forks or aluminum foil. The forks, thanks to their design, facilitate the escape of electrical charges, which can damage the microwave and scare the user”, explains the expert.
The behavior of metal in the microwave is tied to shape in which the magnetron, the part that generates electromagnetic waves in the device, transmits energy to the materials inside. “A rounded spoon absorbs some of this energy, but does not heat to the same level as the surrounding liquid, since it has no sharp edges to intensify the electrical flow.”
The key: heating liquids with rounded metals
Despite the general warning to avoid metallic objects, some microwave manufacturers suggest this in their user manuals add a spoon or round utensil when heating liquids like water or milk. The reason has to do with a phenomenon known as microwave water heating. This effect occurs when the liquid exceeds the boiling point without producing bubbles, which can lead to the risk of splashes when adding substances such as coffee or tea.
“This overheating is a potentially dangerous situation,” Ballesteros points out, but it is resolved “with the introduction of a rounded metal, such as a spoon. Therefore, excess energy is dissipated better, reducing the risk of explosion.” This way, when you add cocoa, coffee or a tea bag, the liquid, instead of exploding violently, boils normally.
Therefore, although it may seem contradictory, in some situations it is advisable to include a metal spoon to improve safety. “The key is to use rounded objects and avoid pointed or metallic ones with sharp edges, as they create concentrations of electrical charge,” says the scientist.
It is mandatory to read the instructions contained in the user manual
While metal in the microwave is believed to be dangerous in all its forms, it is essential to read and follow the manufacturer’s recommendations. “Manuals exist to help consumers use appliances safely. The insertion of a rounded metal spoon may in some cases surprise many, but this practice, in the right context, dissipates energy and helps avoid accidents”, he clarifies. David Ballesteros.
However, the scientist warns that the use of Metal utensils should only be washed when it is safe to do so and according to the manufacturer’s specifications. “Each microwave model may have specific recommendations. An old microwave oven is not the same as one equipped with microwave dispersion technology. Technology advances, but the user must be informed,” he underlines.
Further precautions: if in doubt it is better not to try
While some metal objects may be safe in certain situations, it never hurts to be extra careful. Science communicator David Ballesteros emphasizes avoiding unnecessary risky practices: “If you have doubts, it is always preferable not to put metals in the microwave or consult the manual. Avoiding unnecessary risks is the best way to ensure the correct functioning of the appliance and your safety.”
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Interview between Time.news Editor and Scientific Communicator David Ballesteros
Editor: Welcome, David! It’s fantastic to have you here today. The topic of metals in microwaves has often caused confusion and fear among consumers. Could you start by explaining why not all metals are created equal when it comes to microwave use?
David Ballesteros: Thank you for having me! That’s a great question. It’s true that while we commonly hear warnings about putting metal in microwaves, the reality is more nuanced. The shape and type of metal can significantly affect how it interacts with microwaves. For instance, rounded surfaces like those of a spoon are generally safer compared to sharp objects like forks or aluminum foil.
Editor: Interesting! So, what about those sharp-edged metals? Why do they provoke such dangerous reactions in microwaves?
David Ballesteros: Sharp-edged metals, like forks, create points where electrical charges can concentrate. When microwaves hit these sharp edges, it can lead to arcing—sparks that can damage the microwave and perhaps even scare the user. On the other hand, a rounded object like a spoon tends to absorb energy without causing significant heating at its surface.
Editor: That’s fascinating. I’ve heard of the phenomenon of “microwave water heating,” where liquids can be heated past their boiling point without actually boiling. How does metal play into this situation?
David Ballesteros: Exactly, this is one of the key areas where rounded metal utensils come into play. When water or other liquids are heated in a microwave, they can exceed the boiling point without producing bubbles, leading to superheating. This situation can create dangerous splashes if you add something like coffee or tea. By introducing a rounded spoon into the liquid, the excess energy is dissipated more effectively, allowing for normal boiling and reducing the risk of splashing.
Editor: So, there are circumstances where having a spoon in the microwave can be beneficial. But what precautions should users be aware of before experimenting?
David Ballesteros: It’s crucial to always read and follow the user manual of your microwave. While some manuals may suggest using a rounded metal utensil for safety, this varies from model to model. Not all microwaves have the same dispersion technology, so it’s essential to be informed about your specific appliance.
Editor: That makes sense. Are there specific warnings or practices you want to highlight regarding the use of metal in microwaves?
David Ballesteros: Yes! While some metal objects can be safe under certain conditions, any experimentation should be approached with caution. If you’re ever in doubt about a particular utensil, it’s best to err on the side of caution and not try it. Always ensure that the metal utensil is appropriate for microwave use, and remember to wash it safely according to the manufacturer’s specs.
Editor: Great advice, David. This topic is full of nuances that many people might not know about. any parting thoughts for our readers?
David Ballesteros: Microwave technology has advanced significantly, and staying informed is key to using these appliances safely and efficiently. Don’t hesitate to reach out to your manufacturer if you’re unsure, and remember that understanding the science behind it can help clear up a lot of misconceptions.
Editor: Thank you, David! This has been incredibly enlightening. Your insights will surely help our readers navigate the microwave metal dilemma with more confidence.