Pressure Formula:
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Definition: This calculator computes the actual pressure of a real gas using the reduced Redlich-Kwong equation of state.
Purpose: It helps engineers and scientists determine the pressure behavior of real gases, which deviate from ideal gas behavior.
The calculator uses the formula:
Where:
Explanation: The equation accounts for molecular interactions and finite molecular size in real gases.
Details: Accurate pressure prediction is crucial for designing chemical processes, pipelines, and storage systems.
Tips: Enter the critical pressure, reduced temperature, reduced molar volume (>0.26), and temperature. All values must be positive.
Q1: What is reduced temperature?
A: Reduced temperature is the ratio of the actual temperature to the critical temperature of the substance.
Q2: What is reduced molar volume?
A: Reduced molar volume is the actual molar volume divided by the critical molar volume.
Q3: Why is there a 0.26 constant in the equation?
A: This is an empirical parameter in the Redlich-Kwong equation that accounts for molecular size effects.
Q4: When is this equation most accurate?
A: The Redlich-Kwong equation works well for non-polar gases at moderate pressures.
Q5: How do I find critical pressure values?
A: Critical properties are tabulated in chemical engineering handbooks for common substances.