How can a spark from microwave oven ignite gas fumes?

Microwave ovens generate electromagnetic radiation in the microwave range, typically at a frequency of 2.45 GHz. This radiation is absorbed by water molecules in food, causing them to vibrate and generate heat. Microwaves do not directly interact with gas molecules, so they cannot ignite gas fumes by themselves.

However, if there are metal objects or other conductive materials inside the microwave oven, they can reflect microwaves and cause them to focus in a certain area. This can create hot spots that can ignite flammable materials, including gas fumes.

For this reason, it is important to keep the inside of the microwave oven clean and free of any metal objects, such as utensils or foil. It is also important to avoid putting anything flammable, such as paper towels or plastic containers, in the microwave oven.

If you are using a microwave oven to cook food, it is a good idea to stay nearby to monitor the cooking process and ensure that nothing catches fire. If you see any sparks or flames, turn off the microwave oven immediately and open the door to let the smoke and fumes out. Do not try to put out the fire yourself; call the fire department immediately.