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The Antoine equation is a class of semi-empirical correlations describing the relation between vapor pressure and temperature for pure substances. The Antoine equation is derived from the Clausius–Clapeyron relation. The equation was presented in 1888 by the French engineer Louis Charles Antoine (1825–1897). [1]
Vapor pressure [a] or equilibrium vapor ... Sublimations and vaporizations of the same substance have separate sets of Antoine coefficients, as do components in ...
Values are given in terms of temperature necessary to reach the specified pressure. Valid results within the quoted ranges from most equations are included in the table for comparison. A conversion factor is included into the original first coefficients of the equations to provide the pressure in pascals (CR2: 5.006, SMI: -0.875).
Isopropanol vapor pressure (logarithmic scale) vs temperature. ... Vapor-liquid equilibrium for isopropanol/methanol [4] ... Extinction coefficient, ε 100.2 m 2 /mol IR;
Uses Antoine's equation: = + from Lange's Handbook of Chemistry 10th ed. Here is a similar formula from the 67th edition of the CRC handbook. Note that the form of this formula as given is a fit to the Clausius–Clapeyron equation, which is a good theoretical starting point for calculating saturation vapor pressures:
log 10 of Acetaldehyde vapor pressure. ... Extinction coefficient, ε ? IR; Major absorption bands [4] (liquid film) Wave number transmittance 3432 cm −1: 72%
Vapor pressure of liquid. vapor pressure at 20 °C = 0.556 mbar = 0.417 mmHg [2] ... Extinction coefficient, ε 0.0034 % −1 cm −1 in unpHed water at 260 nm IR;
Accurate saturated vapor pressure values are important in the determination or the description of an azeotrope. The gas fugacity coefficients are mostly set to unity (ideal gas assumption), but for vapor-liquid equilibria at high pressures (i.e. > 10 bar) an equation of state is needed to calculate the gas fugacity coefficient for a real gas ...