CO2 fire extinguisher: Expanding gas freezes into snow.
4C20.45 • C+70+60
Carbon Dioxide gas is allowed to expand quickly from a fire extinguisher. If the gas is directed onto a piece of burlap or black cloth, the 'snow' will last for several minutes and be visible to the class. Point the extinguisher up in the air to simulate a snow storm. TEMPERATURE AND EXPANSION
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