This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A measure of the tendency of a fluid to expand or escape

n. A measure of the relative stability of different phases of a substance under the same conditions

n. Transience

adj. The quality of being fugacious; fugaclousness; volatility.

adj. Uncertainty; instability.

n. The quality of being fugacious; disposition to flee or escape; volatility; transitoriness.

n. the lack of enduring qualities (used chiefly of plant parts)

n. the tendency of a gas to expand or escape

"For example, a profile of the fugacity (partial pressure corrected for the fact that the gas is not ideal) of CO2 (f CO2) shows that Pacific-origin waters below 50 m in Canada Basin are oversaturated due to their origin in the productive Bering/Chukchi Seas (see Fig. 9.34)."

transitoriness    transience    transiency    physical property   

fugaclousness    volatility    uncertainty    instability