Reduced Pressure of Real Gas using Wohl parameter a, and Actual and Reduced Parameters Calculator

Reduced Pressure Formula:

\[ P_r = \frac{P_{gas}}{\frac{a}{6 \times \left(\frac{T}{T_r}\right) \times \left(\frac{V'_m}{V'_r}\right)^2}} \]

Pressure of Gas:

Wohl Parameter a:

Temperature of Real Gas:

Reduced Temperature:

Molar Volume of Real Gas:

m³

Reduced Molar Volume:

m³

Reduced Pressure:

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1. What is Reduced Pressure of Real Gas?

Definition: Reduced Pressure is the ratio of the actual pressure of the fluid to its critical pressure. It is a dimensionless quantity used in thermodynamics.

Purpose: This calculator helps determine the reduced pressure using the Wohl equation of state, which is useful for predicting the behavior of real gases.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_r = \frac{P_{gas}}{\frac{a}{6 \times \left(\frac{T}{T_r}\right) \times \left(\frac{V'_m}{V'_r}\right)^2}} \]

Where:

\( P_r \) — Reduced Pressure (dimensionless)
\( P_{gas} \) — Pressure of the gas (Pascal)
\( a \) — Wohl parameter a (empirical parameter)
\( T \) — Temperature of real gas (Kelvin)
\( T_r \) — Reduced temperature (dimensionless)
\( V'_m \) — Molar volume of real gas (m³)
\( V'_r \) — Reduced molar volume (m³)

Explanation: The formula relates the actual gas pressure to its reduced pressure using the Wohl parameter and other reduced properties.

3. Importance of Reduced Pressure Calculation

Details: Reduced properties are crucial for creating generalized correlations that can predict the behavior of different gases under similar conditions.

4. Using the Calculator

Tips: Enter all required parameters with positive values. The calculator will compute the reduced pressure using the Wohl equation.

5. Frequently Asked Questions (FAQ)

Q1: What is the Wohl parameter a?
A: It's an empirical parameter characteristic to the Wohl equation of state for real gases.

Q2: Why use reduced properties?
A: Reduced properties allow for generalized correlations that work for many different gases.

Q3: What are typical values for Wohl parameter a?
A: Values vary by substance. For example, for methane it's about 2.3026 Pa·m⁶/mol².

Q4: How accurate is this calculation?
A: Accuracy depends on how well the Wohl equation models your specific gas.

Q5: Can I use this for any gas?
A: Yes, as long as you have the correct parameters for your specific gas.