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Going out normally entails walking through doors to escape the noisy freezer. The appliance works relentlessly, ensuring that foodstuffs remain intact. An unexpected power cut can, however, upset the status quo very quickly. Entering again, one may find the food items to be completely frozen despite not being frozen for the whole duration.

This is precisely why the small hack gained popularity. Pour out water into a cup, put a coin on the surface of the frozen water, and step away from it. It may not take more than a minute to know what transpired in the freezer.

The science behind the coin hack

This is how it goes. Fill up a cup with water and allow it to freeze. Then place a coin on the surface of the frozen water and wait for a few minutes before checking on it.

If the coin remains in the same position, chances are that the temperature in the freezer remained constant. However, if the coin sinks below the surface of the frozen water, it shows that there was an incident of ice melting and freezing again.

This action is closely related to the reaction of the ice to temperature fluctuations. According to the paper , during freezing and melting, the crystals will restructure themselves and increase in size. When the crystals restructure, they will shift the object that exists within the ice, which explains why the coin will move as a result of temperature changes.

Its actual significance concerning food safety

Although the coin experiment is convenient, it does not cover all aspects of the issue at hand. For instance, the coin experiment cannot identify the time the freezer was off.

Food safety depends upon both time and temperature. As stated in , a slight temperature variation could affect the quality and safety of foods. In this regard, variations during the process of storage could result in damage which may not be noticed after the food has been refrozen.



An easy technique that should be applied carefully

The greatest advantage of this technique is its simplicity. There is no need to use any kind of equipment, and all that is needed is a cup, water, and a coin.

At the same time, it has limitations. It does not measure exact temperatures. It cannot show how long the outage lasted. In some cases, slight thawing may not move the coin enough to notice.

This is why it becomes more effective when combined with other forms of testing. Ice crystal formations within the package, unusual smells, and texture variations are all red flags indicating that the food may be contaminated.

A few easy things you can do before you leave

These easy actions can make a big difference before you leave. It helps to have a freezer full of food, which ensures consistent temperature control. You can also add frozen water bottles for better cold retention.

Do not frequently open your freezer unnecessarily, especially during a power outage. When the freezer is closed, it will be able to retain its cool temperature for an extended period, typically several hours, or even up to two days under certain conditions.

Small gesture, great comfort

Coin test in the freezer is unique because it is straightforward and realistic. The technique is not a replacement for thorough inspection of food items, but rather a useful reminder where necessary.

Ultimately, all it takes is a small habit to guide your food decisions after your trip. Occasionally, it is the smallest of habits that make you feel a little bit more at ease.