What is the name given to the critical boundary beyond which volatile compounds can condense into solid ice particles?

Answer

The frost line (or ice line)

The frost line, or ice line, marks the distance in the disk where temperatures drop sufficiently low enough for volatile compounds like water, methane, and ammonia to condense into solid ice alongside rock and metal.

What is the name given to the critical boundary beyond which volatile compounds can condense into solid ice particles?

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