Antoineyhtälöstä

Antoineyhtälöstä, commonly referred to as Antoine's equation, is an empirical relationship used in chemical engineering and thermodynamics to describe the relationship between the vapor pressure of a substance and its temperature. It is particularly useful for pure substances over a limited temperature range. The equation is typically expressed in the form log10(P) = A - B/(T + C), where P is the vapor pressure, T is the temperature, and A, B, and C are empirical constants specific to the substance being studied. The constants are determined experimentally.

The Antoine equation is an extension of simpler vapor pressure models like the Clausius-Clapeyron equation but offers greater accuracy for specific temperature intervals. It is widely employed in process design, distillation calculations, and safety assessments where understanding the volatility of materials at different temperatures is crucial. The accuracy of the equation is dependent on the validity of the constants used and the temperature range over which they were derived. Outside of this range, the predictive power of the equation diminishes. Numerous databases and literature sources provide Antoine constants for a vast array of chemical compounds.