A plot of IMC data for a generic exothermic rate process in a sealed ampoule in which the process (and thus the heat flow) begins, accelerates, reaches a peak and then subsides. Below the heat flow plot is a plot showing integration of the heat flow data to give accumulated heat vs. time. As illustrated graphically, the lag phase duration and maximum heat generation rate (growth rate) can be calculated from the integrated data (after Howell, et al. 2011. Used with publisher permission).
Fig. 2