Question

How will you distinguish between fire extinguishing action of water and ${\text{C}}{{\text{O}}_{\text{2}}}$?
A. Water helps to extinguish a fire in two ways: (1) It brings the temperature of the combustible material below its ignition temperature. (2) The water vapour formed due to the heat of fire cuts the supply of oxygen.
B. Carbon dioxide is highly volatile. So, it immediately vaporises to cut off the supply of air, in the absence of a supporter of combustion, fire is extinguished.
C. Both A and B
D. None of the above.

Answer 1

Hint: Fire extinguisher usually contains an agent that is discharged with high pressure in order to extinguish the fire and prevent the risk of re ignition. The extinguisher actively suppresses the action of one of the elements that is causing fire.

Complete step by step answer:
Water type fire extinguishers are able to fight fire involving solid combustibles such as wood, paper and textiles. It penetrates the burning material and creates a cooling effect and prevents re-ignition. Water helps to extinguish a fire in two ways either it brings the temperature of the combustible material below its ignition temperature or the water vapour formed due to the heat of fire cuts the supply of oxygen.
And Carbon dioxide is highly volatile. So, it immediately vaporises to cut off the supply of air, in the absence of a supporter of combustion, fire is extinguished.

So,the correct answer is both A and B.option C.

Additional information:
A fire extinguisher is a fire protection device which is to put a control on the fire by extinguishing it in emergency situations. A fire extinguisher consists of a cylindrical pressure vessel containing an agent which can be used to discharge to extinguish the fire. Fire is formed because of chemical combustion reaction, which involves the reaction between oxygen in the atmosphere and some sort of fuel. 3 essential elements are there in producing fire heat, oxygen and fuel. In order to put the fire out we need to effectively remove one of these elements. Fire extinguisher is like an aerosol can often with two different substances inside, one of them is either solid, liquid or gas substances and the other one is the propellant and it is a pressurised chemical that makes the fire fighting substance come out when we press the extinguisher handle. When we depress the liver at the top of the handle, the material is expelled with high pressure.

Note: Water type fire extinguisher is not suitable for live electrical equipment as water is a good conductor of electricity and even it is not suitable for flammable liquids as it can spread the fire. Water type extinguishers are of two types: cartridge type and stored pressure type.