No, you cannot use a microwave as a fridge. A microwave is designed to generate electromagnetic waves that heat and cook food quickly. It does not have the ability to maintain a consistently low temperature like a refrigerator.
The purpose of a refrigerator is to keep food at a safe and cool temperature, typically between 35°F to 40°F (2°C to 4°C). This temperature range slows down bacterial growth and helps preserve the freshness of perishable items. On the other hand, a microwave heats food quickly, which can accelerate bacterial growth and spoilage.
If you were to store perishable items in a microwave, they would likely spoil much faster than if they were kept in a refrigerator. The exact time before spoiling would vary depending on the specific food item, temperature, and other factors, but it would generally not be a safe or practical method for preserving food. It's essential to use appliances for their intended purposes to ensure food safety and quality.