On the Complete Kelvin Equation
Janet A. W. Elliott

The Kelvin equation quantifies the deviation in equilibrium vapor pressure above a curved surface from that which would exist above a plane surface at the same temperature.  The correct equation and its derivation have been presented in the literature and can even be found in a minority of textbooks.  The majority of textbooks, however, have this equation and its derivation incorrect.  Herein, a complete discussion of the Kelvin Equation and its derivation is presented and errors in often-published derivations of the Kelvin Equation are explicitly pointed out.