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Reduced Pressure of Real Gas given Wohl Parameter a, and Actual and Critical Parameters Calculator

Reduced Pressure Formula:

\[ P_r = \frac{P}{\frac{a}{6 \times T_c \times (V_c)^2}} \]

Pa
K
m³/mol

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1. What is Reduced Pressure of Real Gas?

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.

2. How Does the Calculator Work?

The calculator uses the Wohl equation formula:

\[ P_r = \frac{P}{\frac{a}{6 \times T_c \times (V_c)^2}} \]

Where:

Explanation: The actual pressure is divided by a term involving Wohl parameter and critical properties to obtain the reduced pressure.

3. Importance of Reduced Pressure Calculation

Details: Reduced pressure is crucial for predicting gas behavior, designing chemical processes, and understanding phase equilibria in thermodynamics.

4. Using the Calculator

Tips: Enter the gas pressure, Wohl parameter a, critical temperature, and critical molar volume. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

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.

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