Pressure Formula:
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Definition: This calculator computes the actual pressure of a real gas using the Clausius model, which accounts for molecular volume through parameter b.
Purpose: It helps chemists and engineers determine gas pressures under real conditions, considering molecular interactions and finite molecular size.
The calculator uses the formula:
Where:
Explanation: The formula accounts for the finite size of gas molecules through parameter b, providing more accurate pressure calculations for real gases.
Details: Accurate pressure calculations are crucial for designing chemical processes, predicting phase behavior, and ensuring safety in high-pressure systems.
Tips: Enter the critical temperature in Kelvin, critical volume in m³, Clausius parameter b, and critical pressure in Pascals. All values must be > 0.
Q1: What is the Clausius parameter b?
A: It's an empirical parameter that accounts for the finite volume occupied by gas molecules in the Clausius equation of state.
Q2: How is critical temperature determined?
A: It's the highest temperature at which a gas can be liquefied by pressure alone, unique to each substance.
Q3: When would I use this instead of ideal gas law?
A: For real gases at high pressures or low temperatures where molecular interactions become significant.
Q4: What units should I use?
A: All inputs must be in SI units: Kelvin for temperature, m³ for volume, and Pascals for pressure.
Q5: How accurate is this calculation?
A: More accurate than ideal gas law for real gases, but still an approximation. For precise work, use more sophisticated equations of state.