Critical Pressure Formula:
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Definition: Critical pressure is the minimum pressure required to liquify a substance at its critical temperature.
Purpose: This calculator determines the critical pressure using the Wohl parameter and other actual and reduced parameters.
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.
Tips: Enter Wohl parameter a, temperature of real gas, reduced temperature, molar volume, and reduced molar volume. All values must be > 0.
Q1: What is the Wohl parameter a?
A: It's an empirical parameter characteristic to equation obtained from Wohl model of real gas.
Q2: What are reduced parameters?
A: Reduced parameters are ratios of actual parameters to their critical values.
Q3: Why is critical pressure important?
A: It helps determine conditions needed for gas liquefaction and phase transitions.
Q4: What units should I use?
A: Use Kelvin for temperature, cubic meters for volume, and the calculator will output pressure in Pascals.
Q5: Can this be used for all gases?
A: The Wohl model works best for non-polar or slightly polar gases.