Vapor Pressure Calculator
Vapor Pressure Calculator computes vapor pressure of a liquid using the Antoine equation for a given temperature and substance.
Formulas Used in Vapor Pressure Calculator
The calculator computes the vapor pressure (\\(P\\)) using the Antoine equation:
Antoine Equation:
\\[ \log_{10}(P) = A – \frac{B}{T + C} \\]Conversion to Pa:
\\[ P_{\text{Pa}} = P_{\text{mmHg}} \times \frac{101325}{760} \\]Where:
- \\(P\\): Vapor pressure (mmHg)
- \\(P_{\text{Pa}}\\): Vapor pressure (Pa)
- \\(T\\): Temperature (°C)
- \\(A, B, C\\): Antoine constants (substance-specific)
Example Calculation
Example: Water at T = 25 °C, Antoine constants A = 8.07131, B = 1730.63, C = 233.426
\\[
\log_{10}(P) = 8.07131 – \frac{1730.63}{25 + 233.426}
\\]
\\[
\log_{10}(P) = 8.07131 – \frac{1730.63}{258.426} \approx 1.376
\\]
\\[
P = 10^{1.376} \approx 23.8 \, \text{mmHg}
\\]
\\[
P_{\text{Pa}} = 23.8 \times \frac{101325}{760} \approx 3175 \, \text{Pa}
\\]
Result: \\(P \approx 23.8 \, \text{mmHg}, P_{\text{Pa}} \approx 3175 \, \text{Pa}\\).