In a typical household microwave oven, the temperature inside the microwave itself does not increase significantly during the cooking process. The microwaves generated by the oven are absorbed by the food, causing the food molecules to vibrate and generate heat, which cooks the food.
The heating of food in a microwave oven is a complex process that depends on various factors, including the power output of the microwave, the type and quantity of food being heated, and the initial temperature of the food. The rate at which the food heats up can vary.
It is difficult to provide an exact temperature increase for a specific duration such as 30 seconds, as it depends on the factors mentioned above. However, microwaves are typically designed to deliver a specific power output, often ranging from 600 to 1200 watts in household microwaves. The power output determines how quickly the food will heat up.
If you're looking for a rough estimate, you can consider that microwave ovens generally heat food at a rate of several degrees Celsius per second. Therefore, in 30 seconds, the temperature of the food can increase by several tens of degrees Celsius, depending on its initial temperature and the power output of the microwave.
It's important to note that microwaves heat food unevenly, and certain parts of the food may be hotter than others. Additionally, the temperature distribution within the microwave oven and the food can vary, and factors such as stirring or rotating the food during heating can help distribute the heat more evenly.