1.1 This test method describes the ascertainment of the presence of enthalpic changes in a test specimen, using minimum quantities of material, approximates the temperature at which these enthalpic changes occur and determines their enthalpies (heats) using differential scanning calorimetry or pressure differential scanning calorimetry. 1.2 This test method may be performed on solids, liquids, or slurries. 1.3 This test method may be performed in an inert or a reactive atmospher