Actual Pressure of Real Gas given Wohl Parameter c and Reduced and Critical Parameters Calculator

Pressure Formula:

\[ P = P_r \times \left( \frac{c}{4 \times (T_c^2) \times (V_c^3)} \right) \]

Reduced Pressure:

Wohl Parameter c:

Critical Temperature (K):

Critical Molar Volume (m³/mol):

m³/mol

Actual Pressure (Pa):

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1. What is Actual Pressure of Real Gas Calculator?

Definition: This calculator determines the actual pressure of a real gas using the Wohl equation parameters, reduced pressure, and critical properties.

Purpose: It helps in thermodynamic calculations for real gases where ideal gas law assumptions don't hold.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P = P_r \times \left( \frac{c}{4 \times (T_c^2) \times (V_c^3)} \right) \]

Where:

\( P \) — Actual pressure of the gas (Pa)
\( P_r \) — Reduced pressure (dimensionless)
\( c \) — Wohl parameter c (empirical constant)
\( T_c \) — Critical temperature (K)
\( V_c \) — Critical molar volume (m³/mol)

Explanation: The formula relates the actual pressure to reduced pressure through the Wohl parameter and critical properties.

3. Importance of Pressure Calculation

Details: Accurate pressure determination is crucial for designing chemical processes, pipelines, and storage systems for real gases.

4. Using the Calculator

Tips: Enter the reduced pressure, 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 is reduced pressure?
A: Reduced pressure is the ratio of actual pressure to critical pressure (P/Pc), making it dimensionless.

Q2: How do I find Wohl parameter c?
A: Wohl parameters are typically determined experimentally for each gas or found in thermodynamic tables.

Q3: What are critical properties?
A: Critical temperature and volume are the temperature and volume at which the gas and liquid phases become indistinguishable.

Q4: When is this calculation most useful?
A: For real gases at high pressures or near their critical points where ideal gas law fails.

Q5: What are typical units for these calculations?
A: Pressure in Pascals, temperature in Kelvin, and volume in m³/mol, though other consistent units can be used.