The tendency of a substance to escape, evaporate, or become volatile; in chemistry, a measure of how likely a substance is to leave a system.
From Latin 'fugacitas,' derived from 'fugax' (fleeing), with -ity forming an abstract noun. Adopted into scientific English in the 19th century for thermodynamic calculations.
Fugacity revolutionized chemistry by quantifying molecular desperation—it's literally measuring how much molecules 'want' to escape, turning an abstract concept into a precise number scientists can calculate and predict.
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