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There are various things you can do with a deep freezer other than the obvious storage of frozen food. Some of these things are rather odd, but as this is a page like the Microwave Tomfoolery where you're doing fun experiments into the interesting science, you can expect to find some strange things going on.
Admittedly the domestic deep freezer doesn't offer quite the cryogenic level of strangeness associated with liquid nitrogen and the bizarre things that can be done with it, but nevertheless it's not to be underestimated. Even the fact that you can deliberately cause water to turn to ice opens up a whole realm of investigative messing-about, which as well as revealing some interesting scientific properties of things in the material world, also reveals results which the normal folk find inexplicably bizarre.
Sometimes to make discoveries you have to go against the rules. For example, you're not supposed to freeze milk. However, if you do, it turns slightly yellow. Then if you thaw it out, it turns back to white. (Presumably it's a bit like the fact that solid dairy products such as butter are yellow). Another thing is that substances don't freeze all in one go, so, odd as it may seem, you can get cream and semi-skimmed from the same milk canister
Everyone knows that water freezes to produce ice. However it's not a simple matter, and some odd things happen in the freezing. For one thing, it expands, ice being bigger than the water that formed it (and that's the reason for burst pipes and numerous claims on home insurance). Also, water freezes microscopically different according to conditions, and that produces some interesting effects.
A frozen lake is typically frozen on the surface, leaving the depths still liquid. You can get that effect in a deep freezer by freezing a balloon full of water, the result being a hollow shell if you catch it early enough.
These and other odd experimentals can be put to the test. So, have fun!
A brief warning: Don't freeze water in glass containers. More about this warning can be seen at the end of the page about the milk