1. What is Reduced Saturation Vapor Pressure?

Definition: Reduced saturation vapor pressure is the ratio of actual saturation vapor pressure to critical saturation vapor pressure.

Purpose: It helps in thermodynamic calculations and phase equilibrium studies by providing a dimensionless measure of vapor pressure.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Pr_{sat} \) — Reduced saturation vapor pressure (dimensionless)
• \( P_{sat} \) — Saturation vapor pressure (Pascal)
• \( Pc_{sat} \) — Critical saturation vapor pressure (Pascal)

Explanation: The actual saturation vapor pressure is divided by the critical saturation vapor pressure to obtain the reduced value.

3. Importance of Reduced Saturation Vapor Pressure

Details: This dimensionless quantity is useful in thermodynamic scaling laws and helps compare vapor pressure states across different substances.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is saturation vapor pressure?
A: It's the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature in a closed system.

Q2: What is critical saturation vapor pressure?
A: It's the saturation vapor pressure at the critical point where liquid and vapor phases become indistinguishable.

Q3: What are typical units for these pressures?
A: Pascals (Pa) are the SI units, though atmospheres (atm) or bars are sometimes used.

Q4: What does a Prsat value of 1 mean?
A: A value of 1 indicates the substance is at its critical point.

Q5: Can Prsat be greater than 1?
A: No, since critical pressure represents the maximum possible saturation vapor pressure for a substance.