1. What is Critical Pressure using Wohl Equation?

Definition: This calculator determines the critical pressure of a real gas using the Wohl equation with parameter c.

Purpose: Critical pressure is the minimum pressure required to liquefy a substance at its critical temperature.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

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

3. Importance of Critical Pressure Calculation

Details: Critical pressure is essential for understanding phase behavior and designing processes involving real gases.

4. Using the Calculator

Tips: Enter Wohl parameter c, critical temperature in Kelvin, and critical molar volume in m³/mol. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are Wohl parameters?
A: Wohl parameters are empirical constants characteristic to the Wohl equation of state for real gases.

Q2: How do I find Wohl parameter c?
A: Wohl parameter c can be determined from experimental data or derived from other thermodynamic properties.

Q3: What's a typical critical temperature range?
A: Critical temperatures vary widely but often range from 100K to 600K for common gases.

Q4: What units should I use?
A: Use Kelvin for temperature, m³/mol for volume, and the calculator returns pressure in Pascals.

Q5: Can this be used for all real gases?
A: The Wohl equation works best for non-polar or slightly polar gases at moderate pressures.