Wohl Parameter (b) Formula:
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Definition: Wohl parameter b is an empirical parameter characteristic to equation obtained from Wohl model of real gas.
Purpose: It helps in describing the behavior of real gases, accounting for molecular size and intermolecular forces.
The calculator uses the Wohl equation:
Where:
Explanation: The equation calculates parameter b by considering the molar volume and adjusting for temperature, pressure, and other Wohl parameters.
Details: Accurate calculation of Wohl parameters is essential for modeling real gas behavior in chemical engineering and thermodynamics applications.
Tips: Enter all required parameters in consistent units. The molar volume must be greater than zero, and temperature must be in absolute scale (Kelvin).
Q1: What are typical values for Wohl parameters?
A: Parameters vary by gas. For example, for CO₂: a ≈ 0.365, b ≈ 0.0427, c ≈ 0.0009 (in appropriate units).
Q2: Why use Wohl equation instead of ideal gas law?
A: The Wohl equation accounts for real gas behavior at high pressures and low temperatures where ideal gas law fails.
Q3: What units should I use for pressure?
A: Use Pascals (Pa) for consistency with the universal gas constant in the equation.
Q4: Can this calculator be used for any gas?
A: Yes, but you need the correct Wohl parameters (a and c) for the specific gas you're working with.
Q5: What does a negative result mean?
A: Negative values for b are theoretically possible but may indicate input errors or extreme conditions.