Critical Pressure Formula:
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Definition: This calculator determines the critical pressure of a real gas using the Wohl equation with parameter c.
Purpose: Critical pressure is the minimum pressure required to liquefy a substance at its critical temperature.
The calculator uses the formula:
Where:
Explanation: The formula relates the Wohl parameter to critical properties of a real gas.
Details: Critical pressure is essential for understanding phase behavior and designing processes involving real gases.
Tips: Enter Wohl parameter c, critical temperature in Kelvin, and critical molar volume in m³/mol. All values must be > 0.
Q1: What are Wohl parameters?
A: Wohl parameters are empirical constants characteristic to the Wohl equation of state for real gases.
Q2: How do I find Wohl parameter c?
A: Wohl parameter c can be determined from experimental data or derived from other thermodynamic properties.
Q3: What's a typical critical temperature range?
A: Critical temperatures vary widely but often range from 100K to 600K for common gases.
Q4: What units should I use?
A: Use Kelvin for temperature, m³/mol for volume, and the calculator returns pressure in Pascals.
Q5: Can this be used for all real gases?
A: The Wohl equation works best for non-polar or slightly polar gases at moderate pressures.