Formula Used:
From: | To: |
Definition: This calculator determines the total pressure of a gas using the K-value expression in the Gamma-Phi formulation of Raoult's Law.
Purpose: It helps chemical engineers and researchers calculate gas pressure in non-ideal systems accounting for activity and fugacity coefficients.
The calculator uses the formula:
Where:
Explanation: The formula accounts for deviations from ideal behavior through the activity and fugacity coefficients.
Details: Accurate pressure calculation is crucial for designing chemical processes, predicting phase behavior, and ensuring safety in pressurized systems.
Tips: Enter the activity coefficient (default 0.9), saturated pressure (default 30 Pa), K-value (default 0.85), and fugacity coefficient (default 0.2). All values must be > 0.
Q1: What is the activity coefficient?
A: It measures how much a component deviates from ideal behavior in a liquid mixture.
Q2: What does the fugacity coefficient represent?
A: It accounts for non-ideal behavior in the gas phase, relating fugacity to pressure.
Q3: When would K-value be different from 1?
A: K-value deviates from 1 in non-ideal systems or when components have different volatilities.
Q4: What are typical values for these coefficients?
A: Activity coefficients typically range 0.5-2, fugacity coefficients 0.1-1.5, and K-values 0.1-10.
Q5: How accurate is this calculation?
A: Accuracy depends on the quality of input parameters, especially the coefficients which should be experimentally determined.