FUGACITY
fugacity, fugaciousness
(noun) the lack of enduring qualities (used chiefly of plant parts)
fugacity
(noun) the tendency of a gas to expand or escape
Source: WordNet® 3.1
Noun
fugacity (countable and uncountable, plural fugacities)
A measure of the tendency of a fluid to expand or escape.
(physics) A measure of the relative stability of different phases of a substance under the same conditions.
Transience.
Synonyms
• (transience): ephemerality, impermanence, transiency; see also transience
Source: Wiktionary
Fu*gac"i*ty, a. Etym: [L fugacitas: cf. F. fugacité.]
1. The quality of being fugacious; fugaclousness; volatility; as,
fugacity of spirits. Boyle.
2. Uncertainty; instability. Johnson.
Source: Webster’s Unabridged Dictionary 1913 Edition