The inside of a microwave oven is made of metal, typically stainless steel, for a few reasons:
Reflective Properties: Metal reflects microwave radiation, which allows the microwaves to bounce around inside the oven, ensuring that they are evenly distributed. This reflection helps to cook food more evenly by preventing hot spots.
Easy to Clean: Metal interiors are generally easier to clean and maintain than other materials. Stainless steel is resistant to stains and can withstand the heat and moisture present in the microwave.
Safety: The metal interior of a microwave is designed to contain the microwaves within the oven, preventing them from leaking out and potentially causing harm. The metal acts as a Faraday cage, a structure that blocks or absorbs electromagnetic radiation.
However, while the inside of the microwave is made of metal, it is important to note that not all types of metal are safe to put in a microwave oven. Thin, crinkled, or pointed metal objects, such as aluminum foil or utensils, can cause sparks or electrical arcing if they come into direct contact with the microwave's electrical components or walls. This is why it's crucial to avoid putting metal objects or containers with metallic accents in the microwave, as they can cause damage to the appliance and pose safety risks.
Always refer to the manufacturer's guidelines and use microwave-safe cookware and utensils when heating or cooking food in the microwave.