Pressure of Gas Formula:
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Definition: This calculator determines the actual pressure of a real gas using the Wohl equation parameters, reduced pressure, and critical temperature.
Purpose: It helps in thermodynamic calculations for real gases where ideal gas law assumptions don't hold true.
The calculator uses the formula:
Where:
Explanation: The formula relates reduced pressure to actual pressure through critical temperature and Wohl parameter b.
Details: Accurate pressure calculation is crucial for designing chemical processes, predicting phase behavior, and ensuring safety in high-pressure systems.
Tips: Enter the reduced pressure (dimensionless), critical temperature (in Kelvin), and Wohl parameter b. All values must be > 0.
Q1: What is reduced pressure?
A: Reduced pressure is the ratio of actual pressure to critical pressure (P/Pc), making it dimensionless.
Q2: How do I find critical temperature?
A: Critical temperature is a property of each substance, available in thermodynamic tables or chemical databases.
Q3: What are typical values for Wohl parameter b?
A: Wohl parameter b is substance-specific and typically ranges from 0.001 to 0.1, depending on the gas.
Q4: When would I use this calculation?
A: For real gases at high pressures or near critical conditions where ideal gas law fails.
Q5: What are the limitations of this formula?
A: It's based on the Wohl equation which is an approximation and works best for moderately non-ideal gases.