Students in IS I calculated the rate of sublimation of chunks of dry ice. For the longest time there was only one location in our county to purchase dry ice (local dairy main offices) and now we have to get it in the county to our west (Lancaster). We have to have a commuting teacher pick it up. Students enjoyed observing the dry ice in a beaker of warm water. They used the phase diagram to figure out the behavior of dry ice. They used Logger Pro to graph mass vs time and used the slope to come up with a sublimation rate in g/sec.