system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If water expands when it freezes, why do my icecubes shrink in the tray?
gpt
Your ice cubes are suffering from "freezer burn" because of the extremely dry cold air in the freezer. Water can actually evaporate at all temperatures, even from the surface of solid ice. This is called sublimation.