1. What is Wohl Parameter (c)?

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

Purpose: It's used in thermodynamic equations of state to describe the behavior of real gases, particularly at high pressures.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( c \) — Wohl parameter (dimensionless)
• \( P_c \) — Critical pressure (Pascal)
• \( T_c \) — Critical temperature (Kelvin)
• \( V_c \) — Critical molar volume (m³/mol)

Explanation: The formula relates the Wohl parameter to the critical properties of a substance.

3. Importance of Wohl Parameter Calculation

Details: Accurate calculation of Wohl parameters is essential for precise thermodynamic modeling of real gas behavior, particularly in chemical engineering 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 c?
A: Values vary widely depending on the substance, ranging from very small numbers for simple gases to larger values for complex molecules.

Q2: How accurate is the Wohl equation?
A: The Wohl equation provides reasonable accuracy for many engineering applications, though more complex equations like Peng-Robinson may be more precise.

Q3: Where can I find critical properties for common substances?
A: Critical properties are available in chemical engineering handbooks and thermodynamic databases.

Q4: What units should I use for input?
A: Use Pascals for pressure, Kelvin for temperature, and cubic meters per mole for molar volume.

Q5: Can this calculator be used for mixtures?
A: No, this calculator is for pure substances. Mixtures require additional parameters and mixing rules.