I had a question regarding anomalous expansion of water. So if we have water and we start cooling it up to 4 degrees, water contracts, but after that in the range of 0-4 degree water starts expanding due to hydrogen bonding. The problem was not in this statement but what the book said after it:
This is the primary reason as to why when during winters, when the temperature drops, not all water in the water body freezes, only the surface layer freezes, because as water is being cooled, after 4 degrees, any ice that is formed comes to the top due to it being less dense and ice being a bad conductor of heat insulates the water below it from the outside region hence preventing it from freezing altogether.
But if that is the case, shouldn't we observe a similar thing whenever we freeze water in our refrigerators , we should not have had ice cubes at all. since a similar thing happens here, and the ice tray also being a good insulator, insulating the bottom most water from freezing?