Pressure Formula:
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Definition: This calculator determines the actual pressure of a real gas using its reduced pressure and critical pressure.
Purpose: It helps in thermodynamics calculations where real gas behavior needs to be analyzed, particularly in chemical engineering and physical chemistry applications.
The calculator uses the formula:
Where:
Explanation: The actual pressure is calculated by multiplying the reduced pressure (a dimensionless ratio) by the critical pressure of the gas.
Details: Accurate pressure calculation is essential for designing chemical processes, predicting phase behavior, and ensuring safety in high-pressure systems.
Tips: Enter the reduced pressure (dimensionless) and critical pressure of the gas (in Pascals). Both values must be > 0.
Q1: What is reduced pressure?
A: Reduced pressure is the ratio of the actual pressure to the critical pressure of the substance (Pr = p/Pc).
Q2: How do I find critical pressure?
A: Critical pressure is a property of each substance and can be found in thermodynamic tables or chemical databases.
Q3: Why use reduced pressure in calculations?
A: Reduced properties allow for generalized correlations that work for many substances (law of corresponding states).
Q4: What units should I use?
A: Critical pressure should be in Pascals. Reduced pressure is dimensionless.
Q5: Does this work for ideal gases?
A: This calculator is specifically for real gases which deviate from ideal behavior, especially near the critical point.