Critical Pressure Formula:
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Definition: This calculator determines the critical pressure of a real gas using the reduced Wohl equation, which relates actual gas parameters to their critical values.
Purpose: It helps in thermodynamic analysis and prediction of gas behavior near critical conditions.
The calculator uses the formula:
Where:
Explanation: The formula accounts for deviations from ideal gas behavior using reduced parameters.
Details: Critical pressure is essential for understanding phase behavior, designing industrial processes, and predicting thermodynamic properties of real gases.
Tips: Enter the gas pressure, temperature, critical temperature, molar volume, and critical molar volume. All values must be positive.
Q1: What is reduced temperature and volume?
A: Reduced parameters are ratios of actual values to critical values (T/Tc and V/Vc).
Q2: Why use the Wohl equation?
A: The Wohl equation provides a simple yet accurate way to model real gas behavior.
Q3: What are typical critical pressure values?
A: Critical pressures vary widely (e.g., 3.39 MPa for water, 7.38 MPa for CO₂).
Q4: How accurate is this calculation?
A: Accuracy depends on how well the Wohl equation fits your specific gas.
Q5: What if I get negative results?
A: Check your input values - all must be positive and physically meaningful.