Critical Pressure Formula:
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Definition: Critical pressure is the minimum pressure required to liquify a substance at its critical temperature.
Purpose: This calculator determines the critical pressure using the Wohl equation parameters, which is essential for understanding gas behavior under extreme conditions.
The calculator uses the formula:
Where:
Explanation: The formula relates the critical pressure to temperature and Wohl parameter through fundamental thermodynamic relationships.
Details: Critical pressure is crucial for designing high-pressure systems, understanding phase behavior, and modeling gas properties in chemical engineering applications.
Tips: Enter the gas temperature in Kelvin, reduced temperature (dimensionless), and Wohl parameter b. 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 (T/Tc).
Q2: How do I obtain Wohl parameter b?
A: Wohl parameter b is typically determined experimentally or from critical property data for specific substances.
Q3: What units does this calculator use?
A: Temperature must be in Kelvin, and the result is in Pascals (Pa).
Q4: Can I use this for any gas?
A: This calculation is specific to gases that follow the Wohl equation of state.
Q5: Why is critical pressure important?
A: It defines the conditions needed to liquefy a gas and is essential for phase equilibrium calculations.