Eli5: why do Ice cubes get smaller when left in the freezer for an extended period
In: 10
When a solid goes directly to a gas without being a liquid it is said to *sublime*. Or sublimate is cool now, too, I think. It depends upon air pressure too and on Mars, which is nearly a vacuum, some of the first ice cubes we found [disappeared on camera](https://www.youtube.com/watch?v=VwdX8UELj6c).
https://en.wikipedia.org/wiki/Phoenix_(spacecraft)#Presence_of_shallow_subsurface_water_ice
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