1. An equivalent statement uses thermodynamic activity instead of fugacity . 2. The reaction is used to control the fugacity of oxygen in laboratory experiments. 3. However, phases with high fugacity capacity do not necessarily retain high fugacity. 4. However, phases with high fugacity capacity do not necessarily retain high fugacity . 5. Where Z is a proporational constant, termed " fugacity capacity ". 6. Yet fugacity allows the use of many of the relationships developed for an idealized system. 7. He has developed several multimedia fugacity models. 8. Accurate calculations of chemical equilibrium for real gases should use the fugacity rather than the pressure. 9. One of these mathematical models is a fugacity -based BCF model developed by Don Mackay. 10. The only equation for fugacity I can find for VDW requires calculation of the compressibility factor. 
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