different between fugacity vs fugacious

English

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.

(transience): ephemerality, impermanence, transiency; see also Thesaurus:transience

Borrowed from Latin fug?cius, comparative of fug?citer (“evasively, fleetingly”), from fug?x (“transitory, fleeting”), from fugi? (“I flee”).

fugacious (comparative more fugacious, superlative most fugacious)

Fleeting, fading quickly, transient.
- 1906, O. Henry, "The Furnished Room", in The Four Million:
  Restless, shifting, fugacious as time itself is a certain vast bulk of the population of the red brick district of the lower West Side. Homeless, they have a hundred homes.
- 2011, Michael Feeney Callan, Robert Redford: The Biography, Alfred A. Knopf (2011), ?ISBN, page xvii:
  It may be that Redford's fugacious nature is not so mysterious, that it is studded in the artwork of the labs and the very stones of Sundance.

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