This is mainly because when two grapes are close together, under the condition of high heat concentration, an extremely strong electric field will be generated, and then the concentrated energy will be transferred to the natural sodium and potassium ions in the grapes, so the grapes will catch fire. The diameter of grapes is about the same as the wavelength of energy generated by microwave oven. When two grapes or half grapes are put together, the electromagnetic field inside will interact. The junction of two grapes will produce the strongest point of electromagnetic field. Moreover, the temperature of the production point is very high, and the electrolyte inside the grape will migrate, which is formed at high temperature. After research by scientists, it is found that any salty and water-containing object the size of a grape has similar risks, including two cherry tomatoes, two quail eggs and two extra-large blueberries.
So what about these foods? Let's not heat them in the microwave oven. Microwave ovens use electricity, so all electrical appliances should be careful. Check the power cord, doors and locks of microwave ovens regularly. If it is found to be damaged or poorly closed, stop using it to prevent short circuit of wires or microwave leakage. Don't put away the microwave oven in a hurry after use. Scrub it with a wet rag to keep the oven clean and dry, especially at the crack of the door or the opening of the door, and the microwave feed inlet on the right side of the microwave oven cavity. If food residue is splashed on it, it will be carbonized, causing microwave reflection and burning out the magnetron.