Pressure Formula:
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Definition: This calculator computes the actual pressure of a real gas using the Clausius model, incorporating reduced and critical parameters.
Purpose: It helps in thermodynamics and chemical engineering calculations to determine gas pressure under non-ideal conditions.
The calculator uses the formula:
Where:
Explanation: The formula accounts for deviations from ideal gas behavior using critical parameters and the Clausius model.
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, Clausius parameter c, critical volume, and reduced pressure. All values must be ≥ 0 except temperature which must be > 0.
Q1: What is the Clausius parameter c?
A: It's an empirical parameter in the Clausius equation of state that accounts for molecular volume and intermolecular forces.
Q2: How do I find critical parameters?
A: Critical parameters are typically available in thermodynamic tables for pure substances.
Q3: What is reduced pressure?
A: Reduced pressure is the ratio of actual pressure to critical pressure (P/Pc), used in corresponding states theory.
Q4: When is this calculation most useful?
A: For real gases at high pressures or near critical conditions where ideal gas law fails.
Q5: What are typical units for these parameters?
A: Temperature in Kelvin, volumes in cubic meters, pressure in Pascals, with reduced pressure being dimensionless.