Cold Science: the Curious Chemistry of Liquid Nitrogen
Into a tall, clear glass cylindrical container, about a third full with tap water and dishwashing detergent, Mount Madonna School (MMS) parent John Wagner using metal tongs drops a small chunk of dry ice. “We’re here to talk about things that are cold,” he tells the gathered third and fourth grade MMS students. Dry ice, Wagner says, is frozen carbon dioxide and has a temperature of 123 degrees below zero.