Is solid co2 used in fire extinguishers?

Yes, solid carbon dioxide (CO2), commonly known as dry ice, is used in some fire extinguishers, specifically those designed for electrical and flammable liquid fires. When the dry ice sublimates, it releases carbon dioxide gas, which displaces oxygen and helps to smother the fire. However, most fire extinguishers use liquid CO2, which is more effective for the intended purpose.