Critical Pressure of Wohl's Real Gas using other Actual and Reduced Parameters Calculator

Critical Pressure Formula (Wohl's Model):

\[ P_c = \frac{4 \cdot R \cdot \left(\frac{T}{T_r}\right)}{15 \cdot \left(\frac{V_m}{V_r}\right)} \]

Temperature of Real Gas:

Reduced Temperature:

Molar Volume of Real Gas:

m³

Reduced Molar Volume:

Critical Pressure (Pa):

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1. What is Critical Pressure of Wohl's Real Gas?

Definition: This calculator determines the critical pressure of a real gas using Wohl's model based on actual and reduced parameters.

Purpose: It helps chemical engineers and researchers calculate critical pressure for real gases under various conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_c = \frac{4 \cdot R \cdot \left(\frac{T}{T_r}\right)}{15 \cdot \left(\frac{V_m}{V_r}\right)} \]

Where:

\( P_c \) — Critical Pressure (Pascal)
\( R \) — Universal gas constant (8.314 J/mol·K)
\( T \) — Temperature of real gas (Kelvin)
\( T_r \) — Reduced temperature (dimensionless)
\( V_m \) — Molar volume of real gas (m³)
\( V_r \) — Reduced molar volume

Explanation: The formula relates the critical pressure to the ratio of actual to reduced temperature and molar volume.

3. Importance of Critical Pressure Calculation

Details: Critical pressure is essential for understanding phase behavior, designing chemical processes, and predicting gas properties.

4. Using the Calculator

Tips: Enter the gas temperature, reduced temperature (default 1.46), molar volume (default 0.0224 m³), and reduced molar volume (default 246.78). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is reduced temperature?
A: Reduced temperature is the ratio of the actual temperature to the critical temperature of the substance.

Q2: How do I find reduced molar volume?
A: Reduced molar volume is calculated from the ideal gas law at the substance's critical pressure and temperature per mole.

Q3: What are typical values for reduced temperature?
A: Values typically range between 0.5 and 2.0 for most practical applications.

Q4: Why use Wohl's model?
A: Wohl's equation provides a simple yet reasonably accurate model for real gas behavior.

Q5: What are the limitations of this calculation?
A: The model assumes certain simplifications and may not be accurate for all gases under extreme conditions.