How to Proceed
Fill a Glass: Fill a glass with water and place it in the freezer.
Freeze the Water: Once the water is completely frozen, place a coin on top of the ice and return the glass to the freezer.
What to Check Upon Your Return
Coin on the Surface: If the coin remains on the surface of the ice, there were no power outages.
Coin Partially Embedded: If the coin is partially embedded in the ice, there may have been a brief interruption.
Coin at the Bottom: If the coin is at the bottom of the glass, the power outage was long enough to melt all the ice.
With this simple coin trick, you can easily check the safety of the food in your freezer upon returning from vacation.