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The development of models to mimic physical properties requires extensive databases and a constant updating of these databases. As a result, we have united developed a collaborative interaction with the National Institutes of Standards and Technology in Washington DC in which physical property data flow freely in both directions. We currently supply NIST with sublimation enthalpies of organic compounds. Coupled with our interest to develop models for united such properties is the need to obtain experimental data. A variety of physical properties are measured in our research laboratories that include united measurements of vaporization, sublimation and fusion enthalpies. We are also examining new simpler methods of making these measurements. One such process recently developed, correlation gas chromatography, affords the vaporization enthalpy of a solid or liquids at 298 K by simply using retention time measurements of knowns and unknowns.
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