Personally I'd guess it's similar to the plasma phenomenon seen when microwaving grapes. I have never seen flames on my veggies while nuking them, but I don't usually watch them cook, so I might be missing out on some entertainment. It also sparked when I microwaved Del Monte green beans. Not sure what the issue is. I bought a new microwave and it does the same thing. Tried different plates, etc, same thing. I wonder if there is not something in the bags to keep freshness that has some ore in it.
I wish the FDA would test this instead of blowing it off. I am having the same thing happen, but just recently. Same thing has been happening to me. I thought it was my microwave, as it was a bit old. So, I just got a new, pretty expensive one. Same thing! They all spark like I put metal in the microwave plus some smoke and burn. We had peas spark, and then today sweet potatoes that were already cooked and I warmed them up and got sparks.
They were fresh and never frozen. Both times for me it was from reheating cooked veggies for baby food. This just happened to me with a fresh sweet potato. I steamed it in the microwave with the skin on and it was ok. Later I cut it up into small chunks and re-heated it in the microwave and the sparks flew. This just happened to me while heating up some green beans. I did some playing around with it and found that if I have a a few pieces in the microwave not touching each other, then there are no sparks.
If I touch two of them together, then the sparks and small flame fly! I just had it happen with a sweet potato that was baked yesterday, but I cut the leftovers into chunks and heated it today. It leaves little black marks where the sparks came from and you can even smell it! It also happened a few days ago with some frozen green beans that I had already cooked but was reheating. If a small piece of metal is present in the microwave, it can locally enhance the electric field and make it stronger than the air surrounding it.
For example, when you cut a carrot into small pieces and heat them in the electric field, the pieces will develop different individual charges.
Sometimes these charges will cause sparks between the pieces - similar to a static charge when you touch your doorknob. Chopping vegetables into small pieces and heating them close together increases the likelihood of sparks. On the other hand, if you reheat a vegetable in pasta sauce, a spark will not be likely to occur.
This is because the specific electric field needed will not be created due to the presence of the sauce. It has been found that shape also helps sparks to form—especially pointy edges. So vegetables or plants that have edges or points, like Brussels sprouts or green beans, can act to enhance the electric effect. Looking for more Never Stop Asking "Why? Catch up on all of the past "Why's" on the blog! Mask Policy Update: Masks are required indoors for all visitors ages 2 and older.
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Lights-On: Closed Frightening: Closed. Access Pass. All Exhibits. Indoor Exhibits Year-Round. It may seem similar to the static charge you get touching on touching objects like a doorknob. This indicates that your green beans do not need a high amount of metal ions to create a spark and only a few particles can create a difference in the electric field.
However, if you try heating the same vegetable that is mixed in the pasta sauce then the spark will not occur as it will not generate the electric field around in the same way because of being covered with the sauce.
Green beans have an edgy and pointed shape which makes them more prone to have sparked in the microwave. Many other vegetables like Brussel sprouts can also cause a spark due to their shape. This indicates that most of the edgy or pointy vegetables can cause a spark in the microwave. Hopefully, this blog was helpful to answer your query and now you can check the rest of the vegetables other than green beans causing a spark.
To make sure you don't cook anything that's not microwave-safe, check out the following list of sparkers and exploders culled from a deep dive of googling, YouTube watching, and unfortunate personal experiences so you won't be left with a scary surprise. This is the best and safe way to cook vegetables in the microwave. Or, the next time it needs a solid cleaning, find out how lemon water can help get rid of every crusty food stain ever.
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