In addition to providing cool special effects for stage and film productions, dry ice, also known as CO2, is a great way to maintain the freshness of perishables. Dry ice can be as cold as negative 110 degrees Fahrenheit, which is twice the cooling energy of regular H2O ice. Contrary to H2O ice, however, dry ice does not melt; it vaporizes as it changes from a solid to a gas state. This sublimation creates the cool aforementioned special effect of smoke without the flame, and, more importantly, effectively preserves or cleans without the hazards associated with other cleaning methods. Because…