Home Back

Pressure of Real Gas using Redlich Kwong Equation Calculator

Redlich Kwong Equation:

\[ p = \frac{[R] \times T}{V_m - b} - \frac{a}{\sqrt{T} \times V_m \times (V_m + b)} \]

K
m³/mol

Unit Converter ▲

Unit Converter ▼

From: To:

1. What is the Redlich Kwong Equation?

Definition: The Redlich-Kwong equation is a thermodynamic equation of state used to describe real gases, improving upon the ideal gas law.

Purpose: It provides more accurate pressure predictions for real gases by accounting for molecular size and intermolecular forces.

2. How Does the Calculator Work?

The calculator uses the Redlich-Kwong equation:

\[ p = \frac{[R] \times T}{V_m - b} - \frac{a}{\sqrt{T} \times V_m \times (V_m + b)} \]

Where:

3. Importance of the Redlich Kwong Equation

Details: This equation is particularly useful for chemical engineers and physicists working with real gases at moderate pressures and temperatures.

4. Using the Calculator

Tips: Enter all required parameters (temperature, molar volume, and parameters a and b). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are typical values for parameters a and b?
A: These vary by gas. For example, for nitrogen: a ≈ 1.408 Pa·m⁶·K⁰·⁵/mol², b ≈ 0.0000391 m³/mol.

Q2: When is the Redlich-Kwong equation most accurate?
A: It works best for non-polar gases at temperatures above the critical temperature and pressures below the critical pressure.

Q3: How does this differ from the ideal gas law?
A: It accounts for molecular volume (b) and intermolecular attractions (a), which the ideal gas law ignores.

Q4: What are the limitations of this equation?
A: It becomes less accurate near the critical point and for highly polar gases.

Q5: Can I use this for liquid phases?
A: No, the Redlich-Kwong equation is only valid for gas phases.

Pressure of Real Gas using Redlich Kwong Equation Calculator© - All Rights Reserved 2025