Critical Pressure Formula:
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Definition: Critical pressure is the minimum pressure required to liquefy a substance at its critical temperature.
Purpose: This calculator determines the critical pressure using the Wohl parameter c and other actual and reduced parameters of the gas.
The calculator uses the formula:
Where:
Explanation: The formula relates the Wohl parameter to critical pressure through temperature and volume ratios.
Details: Critical pressure is essential for understanding phase behavior and designing processes involving real gases at high pressures.
Tips: Enter all required parameters with appropriate units. All values must be positive numbers.
Q1: What is the Wohl parameter c?
A: It's an empirical parameter characteristic to the equation obtained from the Wohl model of real gas.
Q2: What are reduced parameters?
A: Reduced parameters are the actual properties divided by their critical values (e.g., Tr = T/Tc).
Q3: What units should I use?
A: Use Kelvin for temperature, cubic meters for volume, and the calculator returns pressure in Pascals.
Q4: How accurate is this calculation?
A: Accuracy depends on the Wohl model's suitability for your specific gas and conditions.
Q5: Can I use this for any gas?
A: The Wohl model works best for non-polar or slightly polar gases. For highly polar gases, other models may be more accurate.