Formula:
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Definition: The Redlich-Kwong parameter b is an empirical parameter characteristic to the equation obtained from the Redlich-Kwong model of real gas.
Purpose: It helps correct the ideal gas law for real gas behavior, accounting for molecular volume and intermolecular forces.
The calculator uses the formula:
Where:
Details: These parameters are crucial for accurate modeling of real gas behavior, especially at high pressures and temperatures where ideal gas laws fail.
Tips: Enter all required values in appropriate units. Ensure temperature is in Kelvin and pressure in Pascals for accurate results.
Q1: What are typical values for parameter a?
A: Parameter a varies by gas (e.g., ~0.4275 for nitrogen, ~2.3026 for water vapor) and depends on critical temperature and pressure.
Q2: What units does this calculator use?
A: Pressure in Pascals, temperature in Kelvin, molar volume in m³/mol, and the result is in consistent derived units.
Q3: When is the Redlich-Kwong equation most accurate?
A: It works best for non-polar gases at moderate pressures (below 10 atm) and temperatures above the critical temperature.
Q4: How does parameter b relate to molecular size?
A: Parameter b is proportional to the actual volume occupied by gas molecules, accounting for their finite size.
Q5: Can I use this for liquid phases?
A: No, the Redlich-Kwong equation is primarily for gas phases. Modified versions exist for liquids.