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:

Where:

• \( P_r \) — Reduced pressure (dimensionless)
• \( P \) — Actual pressure of the gas (Pascal)
• \( a \) — Wohl parameter a (empirical parameter)
• \( T_c \) — Critical temperature (Kelvin)
• \( V_c \) — Critical molar volume (m³/mol)

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.