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2 different types of sublimation

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I’m trying to get the right terms for various forms of phase change. I am familiar with the phase change / triple point diagram for ice, but I have a question. For example we have various terms for the transition of a liquid or solid to a gas, such as boiling, evaporation, vaporization, sublimation. There seems to be a clear distinction between the 2 types of transition between a liquid and a gas: One happens when the substance, let’s say water, boils or vaporizes at it’s boiling point (that varies with pressure of course) and the other type, called evaporation, which occurs at almost any temperature below the boiling point, but it just happens more slowly than boiling. So those 2 types are clear: Boiling / Vaporization vs Evaporation.
However my question relates to the 2 types of phase change which occur when ice changes to gas. I can only find the one word sublimation, however, there are also 2 distinct types of sublimation, that which occurs at the exact temperature (dependent on the pressure), and similar to boiling, it happens rapidly until all the ice is gone (if enough heat is available) – but then there is an analogous change similar to evaporation, where the process is slower because the change from ice to gas can happen at almost any temperature lower than the sublimation temperature. I don’t want to make up a term such as “evaporative sublimation” unless there is really such a term. Can anyone enlighten me on this.


Asked Jon Russell

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