I believe many people have heard the saying: before going out, you must put a coin in the refrigerator. At the beginning, I was as confused as everyone. I didn't know what it meant. Until recently, some friends did it, I suddenly realized it.
It turns out that a coin in the refrigerator was originally sent from the crooked nuts to judge whether the food is fresh or not.
This is because many people may travel far away now. At this time, foreigners think of putting a coin in the water cup which is frozen to determine whether there is power failure. If the coin in the water cup is always on the ice, the refrigerator must have electricity all the time during this period, and the food will also be kept fresh. On the contrary, if the coin sinks into the ice or the bottom of the water, it will prove the period Must have cut off the electricity, then at this time, a lot of food in the home can no longer be used, otherwise it may endanger the health.
So is this method as magical as the legend? Someone did a small experiment, found a cup full of water, then frozen it into ice, then added a coin, then sent it to the refrigerator, and then unplugged the power supply of the refrigerator. Two hours later, he found that the ice layer on the cup was broken and the coin sank to the bottom of the water, which shows that this method is feasible.