Vapor Pressure Formula:
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Definition: Vapor pressure is the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature.
Purpose: This calculator helps determine the vapor pressure of water at specific temperatures, which is important in chemistry, meteorology, and engineering applications.
The calculator uses the Antoine equation:
Where:
Explanation: This empirical relationship describes the relationship between vapor pressure and temperature for water.
Details: Vapor pressure is crucial for understanding evaporation rates, boiling points, and phase transitions. It's used in designing distillation systems, weather forecasting, and industrial processes.
Tips: Simply enter the temperature in Celsius. The calculator works for temperatures between 1°C and 374°C (the critical point of water).
Q1: What are the units for vapor pressure?
A: This calculator provides results in mmHg (millimeters of mercury), a common unit for vapor pressure.
Q2: How accurate is this calculation?
A: The Antoine equation provides good approximations for water vapor pressure in typical temperature ranges.
Q3: Can I use this for other liquids?
A: No, this calculator is specific to water. Other substances have different Antoine equation coefficients.
Q4: Why does vapor pressure increase with temperature?
A: As temperature increases, more molecules have enough energy to escape the liquid phase, increasing the vapor pressure.
Q5: What's the relationship between boiling point and vapor pressure?
A: The boiling point occurs when the vapor pressure equals the surrounding atmospheric pressure.