In an extremely high vacuum chamber, what factor leads to rapid sublimation of ice?

Answer

Water molecules escaping the ice have a very long mean free path before hitting another molecule or wall.

The mean free path dictates how far a molecule travels before collision. In a near-perfect vacuum, this path is very long, meaning escaping molecules are removed efficiently from the surface, resulting in rapid sublimation.

In an extremely high vacuum chamber, what factor leads to rapid sublimation of ice?

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