No, it is not safe to put metal in a microwave oven when popping or heating food. Metal in a microwave can cause dangerous sparks and potentially start a fire.
Microwaves work by emitting electromagnetic waves that excite the water molecules in food, which generates heat and cooks the food. Metal objects, including aluminum foil and aluminum bowls, can reflect these waves and cause a buildup of electric currents. This can result in arcing (sparks) and potentially damage the microwave or cause a fire.
The general rule is to avoid putting any metal objects in the microwave, including aluminum foil, metal containers, utensils, and even metal-trimmed dishes. Always use microwave-safe containers and follow the manufacturer's guidelines for safe microwave use.
If you want to cover your food to prevent splattering, use microwave-safe covers, or opt for microwave-safe containers with microwave-safe lids that allow steam to escape. And always check the manufacturer's instructions for any specific recommendations regarding the use of metal in your microwave oven.