Vapor Pressure Calculator (Antoine Equation)
Calculate vapor pressure using Antoine equation with built-in constants for common chemicals
About this calculator
The Vapor Pressure Calculator uses the Antoine equation to determine the vapor pressure of various chemicals at specific temperatures. This tool is essential for chemical engineers, researchers, and students working with phase equilibrium calculations, distillation processes, and thermodynamic analysis. The calculator includes built-in Antoine constants for common chemicals, eliminating the need to manually look up these values and ensuring accurate vapor pressure predictions for industrial applications.
How to use
Select your desired chemical from the dropdown menu containing built-in Antoine constants, or manually enter custom A, B, and C parameters. Input the temperature in your preferred units (Celsius, Kelvin, or Fahrenheit). Click calculate to instantly obtain the vapor pressure result in various units including mmHg, bar, and Pascal.
Frequently asked questions
What is the Antoine equation and when is it most accurate?
The Antoine equation is log₁₀(P) = A - B/(C+T), where P is vapor pressure and T is temperature. It's most accurate within moderate temperature ranges for each specific chemical.
Which chemicals have built-in Antoine constants in this calculator?
The calculator includes constants for common substances like water, ethanol, benzene, toluene, acetone, and many other frequently used chemicals in industrial and laboratory applications.
What units can I use for temperature and pressure calculations?
Temperature inputs accept Celsius, Kelvin, and Fahrenheit. Results are displayed in multiple pressure units including mmHg, bar, Pascal, atm, and psi for convenience.