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Calculate Vapor Pressure at Given Temperature

Vapor Pressure Formula:

\[ P = 10^{(5.1962 - \frac{1730.63}{T + 233.426})} \]

°C

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1. What is Vapor Pressure?

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.

2. How Does the Calculator Work?

The calculator uses the Antoine equation:

\[ P = 10^{(5.1962 - \frac{1730.63}{T + 233.426})} \]

Where:

Explanation: This empirical relationship describes the relationship between vapor pressure and temperature for water.

3. Importance of Vapor Pressure Calculation

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.

4. Using the Calculator

Tips: Simply enter the temperature in Celsius. The calculator works for temperatures between 1°C and 374°C (the critical point of water).

5. Frequently Asked Questions (FAQ)

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.

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