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 temperature.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{gas} \) — Actual pressure of the gas (Pascal)
• \( P_{reduced} \) — Reduced pressure (dimensionless)
• \( [R] \) — Universal gas constant (8.314 J/mol·K)
• \( T_{critical} \) — Critical temperature (Kelvin)
• \( b \) — Wohl parameter b (empirical constant)

Explanation: The formula relates reduced pressure to actual pressure through critical temperature and Wohl parameter b.

3. Importance of This Calculation

Details: Accurate pressure calculation is crucial for designing chemical processes, predicting phase behavior, and ensuring safety in high-pressure systems.

4. Using the Calculator

Tips: Enter the reduced pressure (dimensionless), critical temperature (in Kelvin), and Wohl parameter b. 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 critical temperature?
A: Critical temperature is a property of each substance, available in thermodynamic tables or chemical databases.

Q3: What are typical values for Wohl parameter b?
A: Wohl parameter b is substance-specific and typically ranges from 0.001 to 0.1, depending on the gas.

Q4: When would I use this calculation?
A: For real gases at high pressures or near critical conditions where ideal gas law fails.

Q5: What are the limitations of this formula?
A: It's based on the Wohl equation which is an approximation and works best for moderately non-ideal gases.