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This Demonstration plots a series of isotherms for a number of real gases using the Dieterici equation of state. The values of

, and

(critical temperature, pressure, and volume),

(attractive and repulsive parameters), and

(compressibility factor) are calculated and displayed. The Demonstration uses Dieterici's equation for

, the critical constants

, and the compressibility factor

. The ideal gas equation is

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Dieterici Equation of State