91影视

Trays filled with water are being put in the freezer.

When the outermost layer is in contact with the surroundings, the surrounding it is at a lower temperature; thus, it will cool down, and the inner closest layer will interact and then cools down, and this interaction will go to the center. This interaction will be in both directions as layers interact with layers from both sides. As all of the layers are not at the same temperature. Therefore, even though the temperature of the outermost layer reaches to 0掳 C and it freezes, the inner layers are not at the same temperature, and they won't freeze.

Thus, all the layers are at different temperatures; even though the outermost layer is at 0掳 C, the water doesn鈥檛 freeze all at once.