As a human, you cannot see microwaves with your naked eye because they are a form of electromagnetic radiation that falls within the non-visible part of the spectrum. Microwaves have wavelengths longer than those of visible light, making them invisible to human vision.
Microwave ovens use microwave radiation to heat up food. When you turn on the microwave, it produces microwaves which are electromagnetic waves with a specific frequency. These microwaves pass through the food and cause the water molecules in the food to vibrate rapidly. This vibration generates heat, which, in turn, heats up the entire food item.
The heat produced by this molecular agitation is what cooks or reheats the food in the microwave oven. Unlike conventional ovens, which rely on conduction and convection to transfer heat to food, microwave ovens work by directly exciting water molecules within the food through the application of microwaves.
It's important to note that not all materials are suitable for microwave cooking. Microwavable containers and dishes are usually made of microwave-safe materials that do not interact with the microwaves or release harmful substances into the food. Always follow the manufacturer's guidelines and use microwave-safe containers to ensure safe and effective cooking or heating of food in a microwave oven.