I had a mini fridge that somehow zeroed in that perfect temp where your average water bottle got perfectly cold but take it out and hit it against an edge and the thing would shift into crystals the whole bottle through. It was so cold and drinking it was glorious.
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I've always wanted to see that happen in person but never had the motivation to set it up. Lucky you getting to see it every time!
If i remember right clear ice forms when you freeze it bottom to top, sounds about right for that spot
edit: i was wrong, it's top to bottom
Strangely, when I first noticed this the other day, the top half of the bottle was frozen, while the bottom half was still liquid. It was an almost perfect 50/50 split. The one in the photo is a different bottle as I drank the first one and watched as the ice melted, but this one now seems to be almost completely frozen, but not quite yet, but still damn near perfectly clear.
Edit: Sometimes the V8 bottles on the top shelf even half freeze, but not often. I guess it partly just depends on the weather and how long the fridge has remained closed. 🤷
Sorry I misremembered, it should be top to bottom. Learned that because NileRed did a video on making perfect ice
Commenting to find this later, need to understand how water could ever freeze in any way besides top to bottom given maximum density at 4C
Insulate the top so the heat is wicked from the bottom. Its actually the more intuitive way for it to freeze for me, since the slightly warmer molecules would tend to rise to the top
And that's the counter-intuitive thing about water. Whereas "hot things rise" is true for almost everything, it isn't for water... at least not in the area around freezing.
Hot things rise because they are less dense than cold. Typically things get more dense the colder they get. Water actually breaks this rule between 4 and 0 degrees C. As you approach freezing, the "slightly warmer" molecules actually sink to the bottom.
Water/ice is a weird substance, especially under unusual conditions such as pressure/vacuum/temperatures, even right here on Earth sometimes..
I saw that video before too, awesome video as always from NileRed, I love his channel 👍
I thought about mentioning it, but it slipped my mind. If I had to guess, water tends to freeze top down because ice floats on water.
I once read that you could get clear ice by boiling the water first to let the dissolved gaz out. Is that a different solution or a legend?
It's a myth, boilng water doesn't make for clearer ice.
There's a bunch of videos like this on YouTube, if you want to learn how to actually make clear ice: https://www.youtube.com/watch?v=RWitzPjzIAk
that does nothing except changes the starting temperature of the water. it might also precipitate any impurities like salts, calcium, chlorines, etc out if you're using tap water.
if you want clear ice use distilled water, slow chilled from top to bottom. you can usually achieve this by using a plastic igloo lunchbox with the lid taken off.

All the clear ice machines I've used, just keep the water agitated while it freezes to get all the gas out. This spot in OP's fridge may just be vibrating due to the pump or compressor in the fridge.
anything to get the bubbles out works, boiling would make the water more pure but air would still be there i think