The vapor pressure for solids is a difficult value to calculate using standard equations because of its small magnitude. The purpose of this research is to develop a method to calculate vapor pressure and then use it to estimate Antoine's constants for the substance. A spreadsheet in Excel was prepared to make this possible so in the future it is easier for oncoming researchers get the information they need.

Three different substances were compared as to see the reliability of the method; these were solid naphthalene, acetic acid and hydrocyanic acid. When calculating these vapor pressures, it is noticeable in the difference percentage how it is more precise to calculate it for liquids than for solids, showing the difference of difficulty in calculating vapor pressure for solids and liquids. The results of these comparisons reflect that the method can be trustful in terms of using it for the estimation of Antoine's constants; otherwise the method tends to be uncertain at least for solids.