One thing that can be hotter than a fully cooked burrito out of the microwave is molten lava. However, I assume you're looking for something more practical and relatable in everyday situations. In that case, one example could be freshly brewed coffee or tea, especially if it's served piping hot.
When it comes to resisting cooling methods, the main factor is heat transfer. Objects cool down when they lose heat to their surroundings. Here are a few reasons why a burrito might stay hot for a longer time:
Thermal insulation: The burrito's outer layers act as a barrier, preventing the heat from escaping quickly. A well-wrapped burrito with insulating materials, such as foil or a tightly sealed container, can help retain the heat.
Heat capacity: The ingredients inside the burrito, such as meat, beans, and cheese, can retain heat due to their high heat capacity. These components can hold onto the thermal energy for longer, keeping the burrito hotter.
Thickness: The thicker the burrito, the longer it takes for the heat to dissipate. A densely packed burrito with multiple layers of filling will resist cooling for a longer duration.
Ambient temperature: If the environment is relatively cool, the temperature gradient between the burrito and its surroundings will be higher. This difference in temperature slows down the cooling process.
While these factors can help a burrito retain its heat, they are not foolproof. Eventually, the burrito will cool down, although it may take longer than some other foods. If you want to defer your meal but keep it warm, you can consider using an insulated food container, such as a thermos or an insulated lunchbox. These containers are designed to retain heat and can prolong the warmth of your food.