In Pollnow the author discussed how to regress the constants A and B in the integrated Clausius/Clapeyron equation of the form log 10 P sat = A -B/T using reference data. However, the constant B is related to the enthalpy of vaporization divided by the molar gas constant, suggesting that the change in compressibility upon vaporization is taken to be 1. In Discoll the author describes an apparatus to measure the enthalpy of vaporization via the Clausius/Clapeyron equation. The form of the Clausius/Clapeyron equation employed neglects (and makes no mention of) the change in compressibility upon vaporization. Fortunately, the author is dealing with low pressures where it is reasonable to assume the change in compressibility upon vaporization is 1. Likewise, Galleano et al. describes modifications that can be made to a commercially available pressure cooker to allow student to measure the enthalpy of vaporization via the Clausius/Clapeyron equation, where the employed form likewise neglects (and makes no mention of) the change in compressibility upon vaporization.