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Find the heat of vaporization of o-xylene at 400° K.

  1. Connect to DIPPR. (This link is to a protected page giving you our login and password. You can use Ctrl-click to open a separate browser window to follow along here.) Points of interest about DIPPR:
    • DIPPR stands for Design Institute for Physical Properties, Project 801, and is now part of the American Institute of Chemical Engineers (AIChE).
    • The database provides evaluated and reliable experimental data and correlations of temperature-dependent properties for over 1800 important pure chemicals.
  2. You can search by chemical name, CAS Registry Number, property values, or empirical formula. Select "Name" from the menu to search for chemical names containing the term "xylene." Avoid "Exact" name searching.

    search form
  3. Select the desired name from the results list.

    The initial page of the substance record contains identification and formula data, structures, and a list of available constant properties. To view temperature-dependent properties such as heat of vaporization, click the "T. Dep Properties" button at top right.

  4. Select the desired property from the pull-down menu.

  5. On this page you can input parameters to calculate properties based on coefficient values shown, in desired units.

    To see original source data, click the View Data button. Data from various sources are tabulated separately, and color-coded according to the evaluated quality.* Data in blue are the accepted references and should be preferred.

  6. You can graph desired data sets by clicking the "Advanced Graphing" button.

  7. Reference format for your reports or papers:
    DIPPR Chemical Database [Online]; (accessed Nov 7, 2017).
    (Don't copy the entire URL of a specific page or data table as this will not work for others. Just use the base URL.)

* To learn more about how DIPPR evaluates thermodynamic property data for accuracy, you can watch short videos on their evaluation basics and systems evaluation methods.

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