Pressure of Gas Formula:
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Definition: This calculator determines the actual pressure of a real gas using the Wohl equation of state, incorporating reduced and actual parameters.
Purpose: It helps in thermodynamic calculations where real gas behavior deviates from ideal gas assumptions.
The calculator uses the formula:
Where:
Explanation: The formula accounts for non-ideal behavior of real gases through the Wohl parameter and reduced properties.
Details: Accurate pressure calculation is crucial for designing chemical processes, pipelines, and storage systems handling real gases.
Tips: Enter all required parameters. Ensure temperature is in Kelvin and volumes are in consistent units. All values must be > 0.
Q1: What is the Wohl parameter a?
A: It's an empirical parameter that characterizes the intermolecular forces in the Wohl equation of state for real gases.
Q2: How do I obtain reduced properties?
A: Reduced properties are obtained by dividing the actual property by its critical value (e.g., P_reduced = P/P_critical).
Q3: When is this calculation most useful?
A: For gases at high pressures or low temperatures where ideal gas law assumptions break down.
Q4: What units should be used?
A: Use consistent units - temperature in Kelvin, volumes in cubic meters, and pressure will be output in Pascals.
Q5: How accurate is this method?
A: The Wohl equation provides reasonable accuracy for many real gases, though more complex equations may be needed for precise calculations.