1. What is Wohl Parameter (a)?

Definition: Wohl parameter a is an empirical parameter characteristic to equation obtained from Wohl model of real gas.

Purpose: It helps in describing the behavior of real gases under various conditions, particularly near critical points.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( a \) — Wohl parameter a
• \( P_c \) — Critical pressure (Pascal)
• \( T'_c \) — Critical temperature (Kelvin)
• \( V'_c \) — Critical molar volume (m³/mol)

Explanation: The formula calculates the Wohl parameter a based on critical properties of the gas.

3. Importance of Wohl Parameter Calculation

Details: Accurate calculation of Wohl parameters is essential for modeling real gas behavior in chemical engineering and thermodynamics applications.

4. Using the Calculator

Tips: Enter the critical pressure in Pascals, critical temperature in Kelvin, and critical molar volume in m³/mol. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for Wohl parameter a?
A: Values vary significantly depending on the gas, ranging from small values for simple gases to larger values for complex molecules.

Q2: How does Wohl parameter a affect gas behavior?
A: It accounts for attractive forces between gas molecules in the Wohl equation of state.

Q3: What's the difference between Wohl and Peng-Robinson models?
A: Both are equations of state for real gases, but they use different parameterizations and are accurate in different regimes.

Q4: Where can I find critical parameters for common gases?
A: Critical parameters are typically available in chemical engineering handbooks or thermodynamic databases.

Q5: What units should I use for input values?
A: Use Pascals for pressure, Kelvin for temperature, and cubic meters per mole for molar volume.