Many people leave home in the morning and return home in the evening. When you go on a trip or stay with a friend for a few days, you are not guaranteed that the electricity will be uninterrupted.
This is one of the biggest problems, because the meat products left in the refrigerator may thaw, and when you consume them, you are at risk of spreading serious diseases. How do we know what happened at home while you were away?
Take a small bowl and freeze the water in the bowl, then put the iron money on top, if you still find the iron money in that place, i.e. there is no problem, if the iron money is submerged in the ice, it means that the electricity was supplied to the refrigerator with a delay and therefore the products will be unfit for food.
