fugacity means A measure of the tendency of a fluid to expand or escape.
fugacity is pronounced /fjuːˈɡæsɪti/.
Why “fugacity” is a great word
A thermodynamic measure of a fluid's tendency to expand or escape and, by poetic extension, the essential quality of being fleeting or transitory. From the Latin fugāx, fugāci- ("apt to flee, fleeting"), from fugere ("to flee") + the noun-forming suffix -acity. Unlike "permanence," which promises an unchanging state, or "volatility," which denotes a specific, often chaotic instability, fugacity is the inherent unsustainability of a condition—the formal, measured recognition of escape itself. It is the precise pressure of a vapor waiting at the lid of a sealed jar, the soft dissipation of breath in cold air, or the morning fog lifting from a river valley before the sun has fully risen—the quiet physics of things defined by their inevitable departure.
Etymology
From Latin fugiō (“flee”) + -acity.
noun
- A measure of the tendency of a fluid to expand or escape.
- A measure of the relative stability of different phases of a substance under the same conditions.
- Transience.e.g.“Duke Orbal disallowed it on the grounds of fugacity.” — 1983, Jack Vance, Cugel's Saga:
Definitions & examples from Wiktionary (CC BY-SA 3.0).
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