If your potato caught fire in the microwave, it was most likely due to the buildup of steam inside the potato. Microwaving a potato without pricking it with a fork or making small slits can lead to an accumulation of steam pressure within the potato. As the steam builds up, it can cause the potato to burst or even catch fire.
Here's what likely happened:
Steam buildup: When you microwave a potato, the heat causes the water inside the potato to turn into steam. Since the potato was not pricked, the steam had no way to escape, and it built up pressure within the potato.
Pressure release: As the steam pressure increased, it eventually found a weak point or a natural opening in the potato (like an eye or a small crack), and this allowed the steam to escape rapidly. When the steam rapidly escaped, it might have caused a small burst of flames, resulting in the fire you observed.
To prevent this from happening in the future, follow these steps when microwaving potatoes:
Always pierce the potato: Before microwaving a potato, use a fork or a small knife to prick several holes in the skin. This will allow the steam to escape gradually and prevent pressure buildup.
Use a microwave-safe plate or paper towel: Place the potato on a microwave-safe plate or wrap it in a damp paper towel. This can help to retain some moisture and prevent the potato from drying out excessively.
Adjust cooking time: Microwaves vary in power, so it's a good idea to start with a shorter cooking time and check for doneness as you go. Cooking times for potatoes can vary based on their size and the microwave's wattage.
By following these precautions, you can safely microwave potatoes without the risk of fire or excessive dryness. Remember that microwaving times and methods can vary, so it's always a good idea to keep a close eye on the cooking process and use the "defrost" or "medium" power setting if your microwave has one, especially for larger potatoes.