On today’s Moment of Science, you’ll hear an exclusive sound recording of what happens when a household fire extinguisher goes bad. The expert said, most fire extinguishers rely on pressurized gas to propel chemicals to put out a fire. Over time, some gas leaks out. That’s why fire extinguishers have expiration dates. To work properly, they need to be recharged to make sure the gas is at the right pressure.
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