Fugacity of component i in Vapor phase

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Equation / Last modified by mike on 2015/07/29 07:19
`hatf_i^V = `
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DavidC.Fugacity of component i in Vapor phase
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a78a017d-3f21-11e3-83ad-bc764e049c3d

Fugacity can be thought of as the activity of a gas.  The fugacity of a component in a mixture at equilibrium is the same whether in vapor or liquid phase.  This equation defines the fugacity of a component in a vapor using the component characteristics of: mole fraction, system pressure, and fugacity coefficient of component in vapor.

The fugacity coefficient `hatvarphi_i`, for component `i` in the vapor is calculated from an equation of state (e.g., Virial). Sometimes it is approximated by a pure component value from a correlation.  The fugacity coefficient is a correction for vapor phase non-ideality.  Often at pressures close to atmospheric, `hatvarphi_i`= 1