If a freezer is a vacuum, it means it lacks air or any other gas particles. In this case, objects placed in the freezer will not freeze because freezing requires the transfer of heat energy from the object to its surroundings. In a vacuum environment, there is no medium (such as air or a refrigerant) available to absorb the heat from the object.
Freezing occurs when the temperature of an object drops below its freezing point, causing the water or other substances within the object to solidify. In a standard freezer, the cooling system removes heat from the surrounding air, causing the air temperature to drop. The cold air then absorbs heat from objects in the freezer, lowering their temperature and potentially causing them to freeze.
In a vacuum, there is no air or gas to absorb heat from the object. As a result, the object cannot transfer its heat energy to the surrounding environment, and thus it remains unfrozen.
It's important to note that achieving a complete vacuum in a freezer is highly challenging and typically not practical in household freezers. Freezers in real-world applications, including household freezers, utilize refrigerants and a sealed system to facilitate the cooling and freezing process.