Critical Pressure Formula:
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Definition: Critical Pressure is the minimum pressure required to liquify a substance at the critical temperature.
Purpose: This calculator determines the critical pressure without using Van der Waals constants, based on critical temperature and volume.
The calculator uses the formula:
Where:
Explanation: The formula relates critical pressure to critical temperature and volume through the universal gas constant.
Details: Critical pressure is essential for understanding phase behavior of substances and designing industrial processes involving supercritical fluids.
Tips: Enter the critical temperature in Kelvin and critical volume in cubic meters. Both values must be > 0.
Q1: What is critical temperature?
A: Critical Temperature is the highest temperature at which the substance can exist as a liquid. At this point, phase boundaries vanish.
Q2: What is critical volume?
A: The Critical Volume is the volume occupied by the unit mass of gas at critical temperature and pressure.
Q3: Why is the universal gas constant used?
A: The universal gas constant relates the energy scale to the temperature scale in the kinetic theory of gases.
Q4: How accurate is this calculation?
A: This provides a theoretical estimate. For real gases, Van der Waals corrections might be needed for higher precision.
Q5: What are typical units for critical pressure?
A: The calculator outputs Pascals, but atmospheres or bars are also commonly used (1 atm ≈ 101325 Pa).