Redlich Kwong Equation:
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Definition: The Redlich-Kwong equation is a thermodynamic equation of state used to describe real gases, improving upon the ideal gas law.
Purpose: It provides more accurate pressure predictions for real gases by accounting for molecular size and intermolecular forces.
The calculator uses the Redlich-Kwong equation:
Where:
Details: This equation is particularly useful for chemical engineers and physicists working with real gases at moderate pressures and temperatures.
Tips: Enter all required parameters (temperature, molar volume, and parameters a and b). All values must be positive numbers.
Q1: What are typical values for parameters a and b?
A: These vary by gas. For example, for nitrogen: a ≈ 1.408 Pa·m⁶·K⁰·⁵/mol², b ≈ 0.0000391 m³/mol.
Q2: When is the Redlich-Kwong equation most accurate?
A: It works best for non-polar gases at temperatures above the critical temperature and pressures below the critical pressure.
Q3: How does this differ from the ideal gas law?
A: It accounts for molecular volume (b) and intermolecular attractions (a), which the ideal gas law ignores.
Q4: What are the limitations of this equation?
A: It becomes less accurate near the critical point and for highly polar gases.
Q5: Can I use this for liquid phases?
A: No, the Redlich-Kwong equation is only valid for gas phases.