In addition to what others have said, some pure substances of only one molecule type, such as in the case of dry ice aka frozen solid carbon dioxide, does not have a liquid stage.
It is called sublimation when a substance directly transitions from a solid to a gas state, and while that is not quite what wood is going through when it is heated into charcoal, the point is that not everything “melts” into a liquid form above its solid state temperature.
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