Microwave Oven

The invention of the microwave is using the electromagnetic waves with specific wavelengths or frequencies. Microwaves have a frequency that can penetrate food molecules (especially water molecules) and excite them.  For a molecule to be excited the electrons orbiting the nucleus have to jump up energy levels. The atom then vibrates faster than normal. Faster atoms and molecules motion is reflected in a higher food temperature. There is a device inside the oven that is the source of the microwave radiation. It is called a magnetron. The waves then travel to the oven cooking chamber through the wave guide and a mode stirrer. Microwaves from the magnetron enter the chamber of the oven through a special channel with metallic walls. The door also has a complex structure, so it should provide an opportunity to review what is prepared inside and not let microwaves get outside. It is multi-layered door made of glass or plastic plates. Between the plates there is a grid of perforated sheet metal. The metal reflects the microwaves back into the cooking chamber, and the small slits don’t let microwaves get outside.