Wohl Parameter (b) of Real Gas Calculator

Wohl Parameter (b) of Real Gas given Actual and Reduced Temperature and Pressure Calculator

Wohl Parameter b Formula:

\[ b = \frac{[R] \times \left(\frac{T_{rg}}{T_r}\right)}{15 \times \left(\frac{P_{rg}}{P_r}\right)} \]

Temperature of Real Gas:

Reduced Temperature:

Pressure of Gas:

Reduced Pressure:

Wohl Parameter b:

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1. What is Wohl Parameter b?

Definition: Wohl parameter b 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, accounting for molecular volume.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ b = \frac{[R] \times \left(\frac{T_{rg}}{T_r}\right)}{15 \times \left(\frac{P_{rg}}{P_r}\right)} \]

Where:

\( b \) — Wohl parameter b
\( [R] \) — Universal gas constant (8.314 J/mol·K)
\( T_{rg} \) — Temperature of real gas (K)
\( T_r \) — Reduced temperature (dimensionless)
\( P_{rg} \) — Pressure of gas (Pa)
\( P_r \) — Reduced pressure (dimensionless)

Explanation: The formula relates the Wohl parameter to the ratio of actual to reduced temperature and pressure.

3. Importance of Wohl Parameter

Details: Wohl parameters are essential for accurate modeling of real gas behavior, especially at high pressures where ideal gas law fails.

4. Using the Calculator

Tips: Enter the real gas temperature (K), reduced temperature, gas pressure (Pa), and reduced pressure. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for Wohl parameter b?
A: Values vary by substance but are typically in the range of 10^-5 to 10^-4 m³/mol.

Q2: How is reduced temperature calculated?
A: Reduced temperature is the actual temperature divided by the critical temperature (T_r = T/T_c).

Q3: What's the physical meaning of Wohl parameter b?
A: It represents the volume excluded by a mole of particles, similar to the van der Waals b parameter.

Q4: When is the Wohl equation most useful?
A: For polar substances and mixtures where more complex equations of state are needed.

Q5: How does this differ from ideal gas calculations?
A: It accounts for molecular volume and interactions, providing more accurate results for real gases.