Critical Temperature Formula:
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Definition: Critical temperature is the highest temperature at which the substance can exist as a liquid. At this temperature, phase boundaries vanish, and the substance can exist both as a liquid and vapor.
Purpose: This calculator determines critical temperature using the Reduced Redlich-Kwong equation of state for real gases.
The calculator uses the formula:
Where:
Explanation: The formula accounts for non-ideal behavior of real gases using reduced properties.
Details: Critical temperature is essential for understanding phase behavior, designing chemical processes, and predicting gas liquefaction conditions.
Tips: Enter the gas temperature in Kelvin, reduced pressure, and reduced molar volume (must be > 0.26). All values must be positive.
Q1: What is reduced pressure?
A: Reduced pressure is the ratio of actual pressure to critical pressure (P/Pc).
Q2: What is reduced molar volume?
A: Reduced molar volume is the ratio of molar volume to critical molar volume (Vm/Vc).
Q3: Why is there a minimum value for reduced molar volume?
A: The equation becomes undefined when Vm,r ≤ 0.26 due to the denominator in the formula.
Q4: How accurate is this calculation?
A: The Redlich-Kwong equation provides reasonable estimates but may need correction factors for precise work.
Q5: Can I use this for any gas?
A: Yes, but accuracy varies. It works best for non-polar or slightly polar gases.