Fire extinguishers contain different chemicals, depending on the application. Handheld extinguishers, which are commonly for use in the kitchen, home, or garage, are pressurized with nitrogen or carbon dioxide (CO2) to propel a stream of the fire-squelching agent to the fire. The active material may be a powder such as potassium bicarbonate (KHCO3), liquid water, and evaporating fluorocarbon or the propelling agent itself. The most effective and conventional fluorocarbon used until recently for this application had been bromochlorodifluoromethane (CF2ClBr).