Question

1.Elders generally advice not to use water to put off the fire on the petrol. Explain​

Answer 1

Answer: The petrol fires are also known as class B fires. Class B fires can be extinguished by foam, powder or carbon dioxide extinguishers.Fire extinguishers with a Class B rating are effective against flammable liquid fires. These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. Two commonly used chemicals are effective in fighting these types of fires.

Step-by-step explanation:

When we are applying water on a petrol fire, we cannot stop the supply of the basic three elements which are oxygen, fuel and heat. Since water is heavier than petrol, petrol will come above the water and continue the contact with the atmosphere (oxygen). Already the existing temperature of the atmosphere will be high due to the fire, most of the water poured will evaporate faster. So, we cannot stop the petrol fires using water.

Answer 2

Step-by-step explanation:

Because there would be technically no point to it, the water would've been evaporated before even reaching the petrol, and that will nothing the fire will still burn with a risk of catching something else on fire because of the massive short height expansion from the water trying to reach the petrol