Fire ExtinguisherA Fire extinguisher are used to control fire and helps to put off fire. A fire extinguisher helps to cut off the supply of air and brings down the ignition temperature. Different types of fire extinguishers are used for different types of fire. Carbon dioxide gas is used to extinguish fires involving electrical equipments and inflammable materials like petrol. Being heavier than oxygen covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled. The added advantage of CO2 is that in most cases it does not harm the electrical equipment. It can be stored at high pressure as a liquid in cylinders. In what form is the LPG stored in cylinders? When released from the cylinder, CO2 expands enormously in volume and cools down. So, it not only forms a blanket around the fire, it also brings down the temperature of the fuel. That is why it is an excellent fire extinguisher. Another way to get CO2 is to release a lot of dry powder of chemicals like sodium bicarbonate (baking soda) or potassium bicarbonate. Near the fire, these chemicals give off CO2.
A woman tying to put off fire using fire extinguisher