Redlich-Kwong Parameter a Formula:
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Definition: The Redlich-Kwong parameter a is an empirical parameter characteristic to the equation obtained from the Redlich-Kwong model of real gas.
Purpose: It helps in describing the behavior of real gases by accounting for intermolecular forces in the Redlich-Kwong equation of state.
The calculator uses the formula:
Where:
Explanation: The formula calculates parameter a based on temperature, molar volume, parameter b, and pressure.
Details: These parameters are crucial for accurate modeling of real gas behavior, especially at high pressures where ideal gas law fails.
Tips: Enter temperature in Kelvin, molar volume in m³/mol, parameter b, and pressure in Pascal. All values must be positive.
Q1: What are typical values for parameter a?
A: Parameter a varies by gas. For example, nitrogen has a ≈ 15.5 Pa·m⁶·K⁰·⁵/mol², while water vapor has a ≈ 142.6 Pa·m⁶·K⁰·⁵/mol².
Q2: How does temperature affect parameter a?
A: The parameter a is temperature-dependent in the Redlich-Kwong equation, decreasing with increasing temperature.
Q3: What's the relationship between a and b parameters?
A: Both parameters account for non-ideal behavior, with a representing intermolecular forces and b representing molecular volume.
Q4: Can I use this for any gas?
A: Yes, but accuracy varies. The Redlich-Kwong equation works best for non-polar or slightly polar gases at moderate pressures.
Q5: Why is the square root of temperature used?
A: The √T term in the Redlich-Kwong equation empirically improves the temperature dependence of the attractive term.