Wohl Parameter (a) Formula:
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Definition: Wohl parameter a is an empirical parameter characteristic to equation obtained from Wohl model of real gas.
Purpose: It helps in describing the behavior of real gases by accounting for intermolecular forces in the Wohl equation of state.
The calculator uses the Wohl equation:
Where:
Details: The Wohl equation provides a more accurate description of real gas behavior compared to the ideal gas law, especially at high pressures and low temperatures.
Tips: Enter the temperature in Kelvin, molar volume in cubic meters, Wohl parameters b and c, and gas pressure in Pascals. All values must be ≥ 0.
Q1: What are typical values for Wohl parameters?
A: Parameters vary by gas. For example, for CO₂: a ≈ 0.365 Pa·m⁶/mol², b ≈ 4.28×10⁻⁵ m³/mol, c ≈ 0.0427 m³·K³/mol.
Q2: How does temperature affect the Wohl parameter a?
A: The parameter a generally decreases with increasing temperature as intermolecular forces become less significant.
Q3: When is the Wohl equation most accurate?
A: The Wohl equation works best for moderately non-ideal gases at intermediate pressures.
Q4: How do I determine Wohl parameters experimentally?
A: Parameters are typically determined by fitting experimental P-V-T data to the Wohl equation.
Q5: What's the difference between Wohl parameters and van der Waals constants?
A: Both account for non-ideal behavior, but Wohl's equation includes an additional parameter (c) for better accuracy.