Pressure Formula:
From: | To: |
Definition: This calculator determines the pressure of a real gas using fugacity and the difference between Gibbs free energy and ideal gas Gibbs free energy.
Purpose: It helps in thermodynamic calculations where real gas behavior deviates from ideal gas assumptions.
The calculator uses the formula:
Where:
Explanation: The formula relates the measurable pressure to fugacity and the difference between real and ideal Gibbs free energies.
Details: This calculation is crucial in chemical engineering and thermodynamics for understanding real gas behavior and phase equilibria.
Tips: Enter the fugacity, Gibbs free energy, ideal gas Gibbs free energy, and temperature. Temperature must be > 0K.
Q1: What is fugacity?
A: Fugacity is a thermodynamic property that measures the "escaping tendency" of a substance from a phase, effectively a corrected pressure for real gases.
Q2: Why do we need both G and Gig?
A: The difference (G - Gig) accounts for the non-ideal behavior of the real gas compared to an ideal gas.
Q3: What units should be used?
A: All energy values should be in Joules, temperature in Kelvin, and fugacity in Pascals for consistent results.
Q4: When is this calculation most useful?
A: Particularly important for high-pressure systems where gases deviate significantly from ideal behavior.
Q5: Can this be used for liquids?
A: The same principles apply, but additional considerations are needed for liquid-phase fugacity calculations.