Vapor Pressure Ratio Formula:
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Definition: This calculator determines the ratio of final to initial vapor pressure using the integrated form of the Clausius-Clapeyron equation.
Purpose: It's used in thermodynamics and physical chemistry to estimate how vapor pressure changes with temperature for a given substance.
The calculator uses the formula:
Where:
Explanation: The formula relates the change in vapor pressure to the temperature change through the substance's latent heat.
Details: Understanding vapor pressure changes is crucial for distillation processes, weather forecasting, and designing pressure systems.
Tips: Enter the latent heat in Joules, initial and final temperatures in Kelvin. All values must be positive.
Q1: What is latent heat of vaporization?
A: The energy required to change 1 mole of liquid to vapor at constant temperature and pressure.
Q2: Why must temperatures be in Kelvin?
A: The Kelvin scale is absolute and ensures correct calculations in thermodynamic equations.
Q3: What does a ratio > 1 indicate?
A: A ratio > 1 means vapor pressure increased (final T > initial T), while < 1 means it decreased.
Q4: How accurate is this calculation?
A: It assumes ideal behavior and constant latent heat, so it's most accurate for small temperature ranges.
Q5: Can I use this for any substance?
A: Yes, as long as you have the correct latent heat value for that substance at the given temperatures.