1. What is the Gas Compressibility Factor?

The compressibility factor (Z) is a dimensionless quantity that describes the deviation of real gas behavior from ideal gas behavior. It compares the actual volume of a gas to the volume predicted by the ideal gas law under the same conditions.

2. How Does the Calculator Work?

The calculator uses the compressibility factor equation:

Where:

• \( Z \) — Compressibility factor (dimensionless)
• \( P \) — Pressure in Pascals (Pa)
• \( V \) — Volume in cubic meters (m³)
• \( n \) — Number of moles (mol)
• \( R \) — Gas constant (8.314 J/mol·K)
• \( T \) — Temperature in Kelvin (K)

Explanation: For an ideal gas, Z = 1. When Z < 1, attractive forces dominate; when Z > 1, repulsive forces dominate.

3. Importance of Compressibility Factor

Details: The compressibility factor is crucial in chemical engineering, thermodynamics, and gas processing for accurate prediction of gas behavior under various pressure and temperature conditions.

4. Using the Calculator

Tips: Enter pressure in Pascals, volume in cubic meters, moles, gas constant (default is 8.314 J/mol·K), and temperature in Kelvin. All values must be positive and non-zero.

5. Frequently Asked Questions (FAQ)

Q1: What does Z = 1 mean?
A: Z = 1 indicates ideal gas behavior, where the gas follows the ideal gas law perfectly.

Q2: When is Z typically less than 1?
A: Z < 1 usually occurs at moderate pressures where intermolecular attractive forces reduce the volume compared to ideal gas prediction.

Q3: When is Z typically greater than 1?
A: Z > 1 typically occurs at high pressures where molecular volume and repulsive forces become significant.

Q4: What is the universal gas constant value?
A: The universal gas constant R = 8.314 J/mol·K is commonly used, but ensure units are consistent with your input values.

Q5: How does temperature affect Z?
A: At constant pressure, Z generally approaches 1 as temperature increases, since thermal energy overcomes intermolecular forces.