Can metal be placed in Microwave? Why or why not?

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SUMMARY

Metal can be placed in a microwave oven if the microwave is large enough to accommodate the piece of metal. While some sources claim that metal reflects microwaves and should not be used, the discussion reveals that when metal is surrounded by a microwave-absorbing medium, such as water, it poses no risk. The key factor is the interaction between the metal and the microwaves, which can vary based on the context of use.

PREREQUISITES
  • Understanding of microwave radiation and its properties
  • Knowledge of materials that absorb microwaves, such as water
  • Familiarity with the design and function of microwave ovens
  • Basic principles of physics related to electromagnetic waves
NEXT STEPS
  • Research the effects of different metals in microwave ovens
  • Learn about microwave radiation and its interaction with various materials
  • Investigate safety guidelines for using microwaves with metal objects
  • Explore the physics behind microwave heating and absorption
USEFUL FOR

Students conducting physics projects, educators teaching about electromagnetic waves, and anyone interested in the safe use of microwave ovens.

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I'm doing a physics project on microwave ovens. I've been researching online and some sites say that you can place metal in microwave ovens because nothing will happen, and some say that you can't because metal reflects microwaves. I'm curious as to what the correct answer is and why. Thanks!
 
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If the microwave is large enough to accommodate the piece of metal; yes- the piece of metal can be placed in a microwave.

That was easy.
 
That was a very clever answer. However, I would still like to know more about this concept. I've always been told not to put metal into the microwave oven, but the more I read about it, the more it seems that there is no harm in doing so. I've also read about the concept that if the metal is placed in something that can absorb the microwaves (such as a spoon in water) than there is no harm. Why is this any different than if the metal is by itself?
 

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