1. What is Reduced Pressure of Real Gas?

Definition: Reduced pressure is the ratio of the actual pressure of a gas to its critical pressure. It's a dimensionless quantity used in thermodynamics.

Purpose: It helps in the study of real gases and their behavior under different conditions using the principle of corresponding states.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_r \) — Reduced pressure (dimensionless)
• \( P \) — Actual pressure of the gas (Pascals)
• \( P_c \) — Critical pressure of the gas (Pascals)

Explanation: The actual gas pressure is divided by its critical pressure to obtain the reduced pressure.

3. Importance of Reduced Pressure Calculation

Details: Reduced pressure is crucial for predicting gas behavior, designing chemical processes, and creating equations of state for real gases.

4. Using the Calculator

Tips: Enter the actual gas pressure and critical pressure in Pascals. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does reduced pressure tell us?
A: It indicates how far a gas is from its critical point, helping predict its behavior and properties.

Q2: What's a typical critical pressure value?
A: Critical pressure varies by substance (e.g., 7.38 MPa for CO₂, 2.21 MPa for CH₄).

Q3: Can reduced pressure be greater than 1?
A: Yes, when the actual pressure exceeds the critical pressure (supercritical conditions).

Q4: How is this different from compressibility factor?
A: Reduced pressure is an input parameter, while compressibility factor is an output describing deviation from ideal gas behavior.

Q5: Where can I find critical pressure values?
A: In thermodynamic property tables or chemical engineering handbooks for specific substances.