Microwave ovens use electromagnetic waves, specifically microwaves, to heat and cook food. These microwaves are absorbed by the water, fats, and sugars in the food, causing them to vibrate and generate heat. This heat then cooks the food from the inside out.
Using metal containers in a microwave is not recommended due to several reasons:
Reflective properties: Metal reflects microwaves, preventing them from penetrating the food. When microwaves are reflected off metal surfaces, they can create sparks and electrical arcing, which can be dangerous and may damage the microwave.
Fire hazard: When microwaves are reflected off metal objects, they can create hotspots on the metal's surface. If the metal container has sharp edges or corners, these hotspots can lead to the formation of electrical arcs that may cause a fire or damage to the microwave's interior.
Potential for explosions: Certain metals, such as aluminum foil or containers with metallic accents, can act as antennas and cause a buildup of electric currents. This can lead to sparking and even potential explosions inside the microwave.
Uneven heating: Metal containers can disrupt the even distribution of microwaves in the oven, leading to uneven cooking or heating of the food. Some parts may be overcooked while others remain undercooked.
To ensure safe and efficient microwave cooking, it's essential to use microwave-safe containers made of materials that allow microwaves to pass through, such as glass, ceramic, or microwave-safe plastics. Always follow the manufacturer's guidelines for microwave use and use containers labeled as "microwave-safe." When using plastic containers, make sure they are specifically marked as safe for microwave use and are free from any damage or warping that could cause harmful chemicals to leach into the food.