Clausius-Clapeyron Equation:
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Definition: This calculator determines the initial pressure of a system using the integrated form of the Clausius-Clapeyron equation.
Purpose: It's used in thermodynamics to calculate vapor pressures at different temperatures, particularly for phase transitions.
The calculator uses the formula:
Where:
Explanation: The equation relates the vapor pressures at two temperatures to the latent heat of the phase transition.
Details: Accurate pressure calculations are crucial for designing systems involving phase changes, such as refrigeration, distillation, and weather forecasting.
Tips: Enter the final pressure, latent heat of vaporization, final temperature, and initial temperature. All values must be > 0.
Q1: What is latent heat in this context?
A: It's the heat required for a phase change (usually vaporization) per mole of substance at constant temperature and pressure.
Q2: Why must temperatures be in Kelvin?
A: The equation requires absolute temperature values, as it involves inverse temperature differences.
Q3: Can I use this for solid-liquid transitions?
A: The equation can be adapted, but typically it's used for liquid-vapor or solid-vapor transitions.
Q4: What's the range of validity for this equation?
A: It works best when the latent heat is constant over the temperature range and the vapor behaves as an ideal gas.
Q5: How accurate is this calculation?
A: It provides good estimates but may need correction factors for precise engineering applications.