1. What is Actual Pressure of Real Gas using Redlich Kwong Equation given 'b'?

Definition: This calculator computes the actual pressure of a real gas using the Redlich-Kwong equation, given the reduced pressure, critical temperature, and parameter b.

Purpose: It helps in thermodynamics and chemical engineering calculations for real gas behavior under various conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( p \) — Actual pressure (Pascal)
• \( P_r \) — Reduced pressure (dimensionless)
• \( R \) — Universal gas constant (8.314 J/mol·K)
• \( T_c \) — Critical temperature (Kelvin)
• \( b \) — Redlich-Kwong parameter b

Explanation: The formula calculates the actual pressure by scaling the reduced pressure with a factor derived from the gas's critical properties.

3. Importance of Pressure Calculation

Details: Accurate pressure calculations are essential 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 Redlich-Kwong 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, making it dimensionless.

Q2: Where can I find critical temperature values?
A: Critical temperatures are tabulated in thermodynamics reference books for common substances.

Q3: How is parameter b determined?
A: Parameter b is typically calculated from critical properties or determined experimentally.

Q4: What are typical units for this calculation?
A: Temperature should be in Kelvin, pressure in Pascals, and parameter b in appropriate units.

Q5: When is the Redlich-Kwong equation most accurate?
A: It works best for non-polar gases at moderate pressures and temperatures.