Unlike a foam fire extinguisher, carbon dioxide fire extinguishers do not leave any residue; you can use them on things such as flammable liquids, petrol, and oils, as well as electrical apparatus such as laptops and phone chargers. On the other hand, foam extinguishers can also extinguish flammable liquids, petrol, and oils, as well as wood, paper, plastics, and soft furnishings.