Unfortunately, it is not possible to directly convert a temperature setting, such as 260°C, to a wattage setting on a microwave oven. The wattage setting on a microwave refers to the power level at which the microwave oven operates, not the temperature it can reach.
Microwave ovens work by emitting electromagnetic waves that excite water molecules in the food, generating heat. The power level determines how much energy is emitted by the microwave. Higher wattage settings result in more energy being emitted, which leads to faster and more intense heating.
To achieve a specific temperature in the bowl, you would need to experiment with different wattage and time settings to find the right combination that achieves the desired temperature. However, it's important to note that microwaves are not typically used for precise temperature control like conventional ovens.
If you have specific temperature requirements for your cooking or heating needs, it is advisable to use an appropriate kitchen appliance designed for temperature-controlled cooking, such as an oven or stove. Microwaves are generally better suited for tasks like reheating, defrosting, or quickly cooking food rather than precise temperature control.