There is a very high energy requirement for the conversion of Li to gas at boiling point.
We have to recall that the intermolecular forces hold a substances together in a particular state of matter. Matter exists in three states;
Given the fact that the transitioning of Li from liquid to gas implies the breaking off of all the metallic interaction that holds the substance together, a lot of energy is required. This high energy requirement is confirmed by the fact that Li boils more than 1100°C higher than it melts.
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