Water evaporates off the surface of food because of temperature fluctuations. Items in a freezer are usually not completely enclosed in ice or another material. Even if they are wrapped somewhat tightly, they are surrounded by pockets of air. Food may also accumulate smells of other things in the freezer.
Water evaporates off the surface of food because of temperature fluctuations. Items in a freezer are usually not completely enclosed in ice or another material. Even if they are wrapped somewhat tightly, they are surrounded by pockets of air. Food may also accumulate smells of other things in the freezer.
Water evaporates off the surface of food because of temperature fluctuations. Items in a freezer are usually not completely enclosed in ice or another material. Even if they are wrapped somewhat tightly, they are surrounded by pockets of air. Food may also accumulate smells of other things in the freezer.
In this case, it’s *generally* not spoiling due to bacterial activity, but rather it becomes unpalatable or otherwise undesirable.
One culprit is oxidation. This is basically food ‘rusting’. Think meat and fruit turning brown.
Another issue is cellular degradation. In a normal freezer, ice inside and around the cells form crystals which break the cells and degrade the tissue.
These two problems combined are generally referred to as ‘freezer burn’. ~~They are amplified by the fact that many modern freezers *don’t continuously freeze.*. They are self-defrosting, so they come up slightly above freezing to defrost for a brief period of time. These freeze-thaw cycles can degrade the food like winters cause potholes. They also provide brief windows for slow bacterial growth.~~
In this case, it’s *generally* not spoiling due to bacterial activity, but rather it becomes unpalatable or otherwise undesirable.
One culprit is oxidation. This is basically food ‘rusting’. Think meat and fruit turning brown.
Another issue is cellular degradation. In a normal freezer, ice inside and around the cells form crystals which break the cells and degrade the tissue.
These two problems combined are generally referred to as ‘freezer burn’. ~~They are amplified by the fact that many modern freezers *don’t continuously freeze.*. They are self-defrosting, so they come up slightly above freezing to defrost for a brief period of time. These freeze-thaw cycles can degrade the food like winters cause potholes. They also provide brief windows for slow bacterial growth.~~
In this case, it’s *generally* not spoiling due to bacterial activity, but rather it becomes unpalatable or otherwise undesirable.
One culprit is oxidation. This is basically food ‘rusting’. Think meat and fruit turning brown.
Another issue is cellular degradation. In a normal freezer, ice inside and around the cells form crystals which break the cells and degrade the tissue.
These two problems combined are generally referred to as ‘freezer burn’. ~~They are amplified by the fact that many modern freezers *don’t continuously freeze.*. They are self-defrosting, so they come up slightly above freezing to defrost for a brief period of time. These freeze-thaw cycles can degrade the food like winters cause potholes. They also provide brief windows for slow bacterial growth.~~
Food is chemicals and chemicals will degrade even when frozen. There is no bacterial growth, but the quality of the food will degrade to the point where it will not taste the same anymore.
This is why in research settings liquid nitrogen is used for preserving biological and sometimes chemical samples for a very long time. 0 degrees C is still very far above absolute zero and chemical reactions do still happen.
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