I have an ice cube tray that lives in my freezer. Earlier today, I used the last of my ice cubes, so I filled it with water and stuck it in the freezer again. Just now (maybe an hour later? It’s been a few hours at most), I open up the freezer again, and see this:
(taken out of the freezer and photographed with a Kleenex box as a backdrop) The tops of the ice cubes are frozen, but there is still liquid water underneath. The interesting thing, though, is that one spot has risen up about half a centimeter higher than the rest. What caused this to happen? Why isn’t the surface totally flat, like it was when I put it in?
Details that may or may not be important:
- I know there is liquid water underneath because I thought there wasn’t and flexed the tray to crack the cubes loose, and some water came out and then there were air bubbles floating around under the cubes.
- I kinda over-filled the tray, so that all the cubes are connected by a thin sheet of ice that goes over the plastic dividers in the tray.
- When I filled the tray with water, there were some small bits of ice stuck in the bottom of the tray, maybe a third the size of a normal ice cube. These were left over from cubes that had cracked in two, where I used the top part but couldn’t get the bottom part out. I expect they’ll become part of the new batch of ice cubes, but I haven’t checked on that yet.