Putting two plates together in a microwave oven is not recommended and can lead to several potential issues:
Uneven Heating: When plates are stacked together, the microwave's electromagnetic waves may not be able to penetrate both plates effectively. This can result in uneven heating, where some parts of the food on the plates might be overcooked while others remain undercooked.
Safety Concerns: Stacking plates can create a barrier that traps steam and pressure between the plates. This can potentially cause the plates to explode or shatter due to the build-up of steam and pressure, leading to dangerous situations and injuries.
Fire Hazard: If the plates are made of materials that are not microwave-safe, they could potentially catch fire or release harmful fumes when exposed to microwave radiation.
Damage to the Microwave: Stacking plates in the microwave can interfere with the proper functioning of the appliance. The microwave's turntable might get stuck or be unable to rotate properly, leading to uneven heating and potential damage to the microwave's motor.
To ensure safe and effective microwave cooking, it's best to place one plate at a time in the microwave. If you need to heat multiple plates of food simultaneously, it's better to use the microwave in batches, heating one plate at a time to ensure even and safe cooking.
Also, always make sure that the plates you use are labeled as microwave-safe, and avoid using plates with metallic accents or decorations, as they can cause sparking and other issues in the microwave. When in doubt, check the manufacturer's guidelines on the plates or use microwave-safe containers specifically designed for microwave cooking.