Question

How water helps in extinguishing fire?
A.Water cools the combustible material so that its temperature is brought below the ignition temperature.
B.Water heats the combustible material so that its temperature is brought below the ignition temperature
C.Water cools the combustible material so that its temperature is brought above the ignition temperature
D.None of these

Answer 1

Hint: Fire can burn under water. Normally, water puts out a fire by stopping two of the three parts of the fire triangle. Water contains oxygen molecules and oxygen is harder to get out of water. Fire is a chemical reaction between oxygen and the fuel. Fire extinguishers try to separate the fuel from the oxygen.

Complete step by step answer:
Water is useful to extinguish fire. Water puts out fire by creating a barrier between the fuel source and the oxygen source. Here water cools the combustible material so that its temperature is brought below the ignition temperature. Water has the nature to extinguish fire. Fire is the chemical reaction which occurs in the presence of oxygen. Water can react with some metals and chemicals to directly accelerate the fire. Water exothermically reacts with nuclear fuel elements cladding under accident conditions to generate explosive hydrogen.

Hence option (A) is the correct answer.

Note: Here we remember how water is helpful to control fire. Water is formed by oxygen and fire is also a chemical reaction between oxygen and the fuel. Oxygen is an important gas for fire. In the case that oxygen removal is more important than cooling the seat of the fire.