What Happens When You Put a Metal Can in the Microwave: Everything You Need to Know

Many people have wondered if it's safe—or even interesting—to put a metal can in the microwave. But is it really a good idea? Let's explore the facts and myths around this experiment.

Myth: It's a Waste of Time and Dangerous

It is true that putting metal in the microwave doesn't turn out well. A metal can will reflect the microwaves, leading to arcing and possibly causing a fire. This isn't just a waste of time; it can be incredibly dangerous. Don't try it at home.

Why Experiment?

If you want a quick and easy experiment, put a can in the microwave and observe the results. However, keep in mind the potential dangers. After conducting the experiment, share your findings here or with your peers for educational purposes.

Scientific Explanation

Can Metal Can Arc Without Sharp Corners?
Not all metal cans will arc, especially those that are not within a few millimeters of a side wall and lack sharp corners or edges. This reduces the likelihood of arc formation. However, a metal surface that is highly reflective but does not absorb microwave energy does not generate an electric field at the metal surface, so it remains cool.

Effect on Microwave Oven
A metal can in the microwave creates a "no load" condition, meaning the oven detects no food inside. This can overload the magnetron, the component responsible for producing microwaves. Overheating the magnetron can lead to serious damage or even a fire.

Personal Experience

According to someone who has worked as a maintenance technician in a hospital, arcing and explosions occur quite frequently when metal cans are put in the microwave. Nurses, typically smart individuals, know to avoid this practice.

Common Consequences

Arching and Sparks
When a can is placed in the microwave, it will arc and generate blue sparks. In some cases, the can may even explode, potentially damaging the oven or starting a fire. Although rare, some stories exist of such explosions occurring.

Protective Measures
If you insist on trying this experiment, be aware that the outcome can range from no noticeable effects to serious arcing and potential damage to the appliance. Some recipes require wrapping exposed bones in aluminum foil to prevent overcooking, making this practice somewhat of an exception.

Conclusion

Putting a metal can in the microwave is not advised. It can be dangerous and lead to serious consequences such as arcing, sparks, and possible damage to the appliance. Experiments should be conducted with caution and only if the potential risks are fully understood. Though it may make for an interesting discussion, it's better to err on the side of safety.