Construct · 1 fields · 3 citations

fugacity: a standalone construct

One name. One construct. A landmark on the map.

● anchor · a standalone construct Nearest construct by meaningvolatilitycompare the meanings
How to read this

Every construct on the map is compared with every other by the meaning of its definitions, and the closest one is surfaced here. The nearest construct to fugacity is volatility.

Hold this as a prompt, not a verdict. Two constructs sitting close in meaning is a reason to read them side by side and decide for yourself whether they are one idea under two names. It is not proof that they are. Compare the meanings in the Collider.

fugacity1 CONSTRUCTFugacityLEWIS · ESCAPING TENDENCY

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Physical Chemistry

The effective pressure that measures a substance's tendency to escape a phase

Gilbert N. Lewis introduced fugacity in his 1901 paper The law of physico-chemical change, offering it as a measure of a substance's escaping tendency, the effective pressure a real gas would appear to exert if it behaved ideally. Fugacity, from the Latin for fleeing, is an effective partial pressure that takes the place of the true pressure in thermodynamic equations so that a real gas obeys the same simple relations an ideal gas does, correcting for the molecular attractions and finite molecular volume that make the actual pressure an imperfect guide to how readily a substance will leave a phase. Lewis and Randall's 1923 textbook Thermodynamics and the Free Energy of Chemical Substances established fugacity, alongside the related quantity activity, as a standard tool of physical chemistry, and the ratio of fugacity to pressure, called the fugacity coefficient, records how far a gas departs from ideal behaviour and equals one for an ideal gas. Because it carries the units of pressure yet already folds in a substance's tendency to escape or expand from a phase, fugacity lets chemists compute chemical equilibrium and phase behaviour for real gases, liquids, and mixtures using expressions written for the ideal case.[1][2][3]

Unit
Has the units of pressure (for example pascals or atmospheres); the derived fugacity coefficient, its ratio to the true pressure, is dimensionless
Recovery means
Not applicable
Measured by
Computed from measured pressure, volume, and temperature data through an equation of state, or via the fugacity coefficient obtained from the real gas's compressibility

Next

Run it through the Collider, or take the citations with you.

See how fugacity sits against neighbouring constructs in the Collider, or export every reference on this page in one click.

Open in ColliderExport BibTeXReport this entry

Nearby constructs

pressure6 fields · 13 citationsjingle · one name, six constructsfree energy3 fields · 7 citationsjingle · one word, three constructsequilibrium4 fields · 4 citationsjingle · one word, four constructs

References

  1. Lewis, G. N. (1901). The law of physico-chemical change. Proceedings of the American Academy of Arts and Sciences, 37(3), 49. https://doi.org/10.2307/20021635
  2. Lewis, G. N., & Randall, M. (1923). Thermodynamics and the free energy of chemical substances. McGraw-Hill.
  3. International Union of Pure and Applied Chemistry. (2019). Fugacity. In Compendium of chemical terminology (the Gold Book). IUPAC. https://doi.org/10.1351/goldbook.F02543

Cited on this page?

Confirm your construct, or correct us.

If your work is cited behind one of these entries, you know better than we do whether we captured the meaning right. Confirm it, suggest an edit, or dispute it, and your name goes on the entry as an author who has checked it, linked to your ORCID.

Claim your construct