Critical Pressure Formula (Wohl's Model):
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Definition: This calculator determines the critical pressure of a real gas using Wohl's model based on actual and reduced parameters.
Purpose: It helps chemical engineers and researchers calculate critical pressure for real gases under various conditions.
The calculator uses the formula:
Where:
Explanation: The formula relates the critical pressure to the ratio of actual to reduced temperature and molar volume.
Details: Critical pressure is essential for understanding phase behavior, designing chemical processes, and predicting gas properties.
Tips: Enter the gas temperature, reduced temperature (default 1.46), molar volume (default 0.0224 m³), and reduced molar volume (default 246.78). All values must be > 0.
Q1: What is reduced temperature?
A: Reduced temperature is the ratio of the actual temperature to the critical temperature of the substance.
Q2: How do I find reduced molar volume?
A: Reduced molar volume is calculated from the ideal gas law at the substance's critical pressure and temperature per mole.
Q3: What are typical values for reduced temperature?
A: Values typically range between 0.5 and 2.0 for most practical applications.
Q4: Why use Wohl's model?
A: Wohl's equation provides a simple yet reasonably accurate model for real gas behavior.
Q5: What are the limitations of this calculation?
A: The model assumes certain simplifications and may not be accurate for all gases under extreme conditions.