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An italic f, an effective pressure for a real gas.
Also known as: Fugacity, Effective pressure, Escaping tendency
Fugacity is the pressure a real gas would need to have to behave like the ideal gas equations expect. It exists so that the clean thermodynamic relations derived for ideal gases can be used unchanged on real ones by substituting one quantity for another.
Denotes fugacity, the effective pressure of a real gas in thermodynamic expressions derived for ideal gases.
Contexts: Laboratory
Approaches the actual pressure as the gas becomes ideal, so its ratio to pressure — the fugacity coefficient — measures departure from ideality.
Contexts: Laboratory
An italic lowercase letter f, a vertical stroke with a hooked top and a crossbar.