Critical Molar Volume Formula:
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Definition: Critical Molar Volume is the volume occupied by gas at critical temperature and pressure per mole in the Peng-Robinson model.
Purpose: It's essential for thermodynamic calculations and understanding gas behavior near critical conditions.
The calculator uses the formula:
Where:
Explanation: The formula calculates the critical volume based on Wohl parameter and the ratio of actual to reduced pressure and temperature.
Details: Critical properties are crucial for phase equilibrium calculations, process design, and understanding supercritical fluid behavior.
Tips: Enter all parameters (Wohl parameter c, gas pressure, reduced pressure, gas temperature, and reduced temperature). All values must be > 0.
Q1: What is the Wohl parameter c?
A: It's an empirical parameter characteristic to the Wohl equation of state for real gases.
Q2: How do I get reduced pressure and temperature?
A: Reduced pressure is actual pressure divided by critical pressure. Reduced temperature is actual temperature divided by critical temperature.
Q3: What units should I use?
A: Use Pascals for pressure, Kelvin for temperature, and the calculator will output m³/mol.
Q4: When is this calculation most useful?
A: For thermodynamic modeling of real gases, especially near critical conditions.
Q5: How accurate is this model?
A: The Peng-Robinson model provides good accuracy for many non-polar and slightly polar compounds.