Putting ashes in a microwave and turning it on is dangerous and should never be attempted. Doing so can result in a variety of hazardous outcomes:
Fire hazard: Ashes may contain hot embers or residue from flammable materials. When subjected to microwave radiation, these particles can ignite, leading to a fire inside the microwave.
Microwave damage: The microwave cavity is designed to heat food safely and evenly. Ashes can cause irregular heating patterns and potentially damage the microwave's interior, leading to malfunctions and making it unsafe for future use.
Release of toxic gases: Certain materials, such as synthetic materials or chemicals that have been burned, may release harmful gases when heated in a microwave. These gases can pose health risks and cause respiratory problems if inhaled.
Risk of explosion: If the ashes contain any metallic components, like screws or nails, they could cause sparks and potentially lead to an explosion inside the microwave.
Microwave safety features: Most modern microwaves have safety features that shut off the microwave when detecting irregularities or potential fire hazards. If ashes cause these features to activate, the microwave may become inoperable, and you'll need to deal with the dangerous situation inside the microwave.
In summary, putting ashes in a microwave is a highly dangerous and ill-advised action that can result in fire, damage to the microwave, release of toxic gases, and the risk of an explosion. Always follow the manufacturer's instructions for proper use of your microwave and avoid using it for anything other than its intended purpose, which is heating food safely.