Reduced Pressure Formula:
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Definition: Reduced pressure is the ratio of the actual pressure of a fluid to its critical pressure. It's a dimensionless quantity used in thermodynamics.
Purpose: It helps in comparing the behavior of real gases under different conditions using the principle of corresponding states.
The calculator uses the Wohl equation formula:
Where:
Explanation: The actual pressure is divided by a term involving Wohl parameter and critical properties to obtain the reduced pressure.
Details: Reduced pressure is crucial for predicting gas behavior, designing chemical processes, and understanding phase equilibria in thermodynamics.
Tips: Enter the gas pressure, Wohl parameter a, critical temperature, and critical molar volume. All values must be positive numbers.
Q1: What is Wohl parameter a?
A: It's an empirical parameter characteristic to the Wohl equation of state for real gases.
Q2: Where can I find critical properties of gases?
A: Critical properties are typically available in chemical engineering handbooks or thermodynamic databases.
Q3: What units should I use?
A: Use Pascals for pressure, Kelvin for temperature, and cubic meters per mole for volume.
Q4: Why is reduced pressure dimensionless?
A: Because it's a ratio of two pressures (actual and a pressure term from Wohl equation).
Q5: Can I use this for any gas?
A: This calculation is specific to gases modeled with the Wohl equation of state.