In which two situations should water not be used to extinguish fire Why?

In which two situations should water not be used to extinguish fire Why?

Water cannot put off fire produced due to burning petrol and oil because water is heavier than oil. It settles down or sinks below the oil particles and cannot bring the ignition temperature of the substance down or cannot cut off the supply of air to the fire.

Why water Cannot be used for extinguishing the fire?

Water is not used for extinguishing fires caused due to electrical faults, because water is a good conductor of electricity. If water is poured on an electrical fire, the water could conduct electricity causing the person may experience an electric shock.

Which fire Cannot be extinguished by water?

Water does not extinguish Class B fires and can spread the flammable liquid, making it worse. You must only put out these fires with powder, foam, or carbon dioxide extinguishers to cut off the fire’s oxygen supply. You therefore, cannot use water on these fires and can only use a dry powder extinguisher.

Why is water not used to extinguish most fires in an organic lab?

Trying to extinguish a fire involving organic solvents with water is counterproductive since most organic solvents do not mix with water and will float on top of water. A stream of water is more likely to spread the solvent and fire. For this reason, water should be not used to extinguish solvent fires.

Why should water not be used to extinguish fire due to kerosene or petrol?

Why can’t water be used in case of fire caused by flammable liquids?

Class B fires involve flammable liquids rather than solids. Common causes for these fires include gasoline, alcohol, and oil. Use a powder or carbon dioxide extinguisher to put these fires out. Water and foam cannot be used as they are both electrical conductors and can make the situation more dangerous.

Which of the following Cannot be used to extinguish the fire caused by electricity?

Water being a good conductor of electricity can cause electric shock to the person trying to put off the fire caused by any electrical appliance. Hence, fire caused by electrical appliances should not be put off using water.

Which of the following Cannot be extinguished with water?

The fire produced by burning oil and petrol cannot be extinguished by using water. This is because water is heavier than oil and petrol.So,when water is thrown over burning oil,it settles down.

Why Cannot water be used to extinguish fire caused by oil and petrol?

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.

Why we should not pour water on fire caused by electricity?

Explanation: (1) Water is a very good conductor of electricity, by throwing water at an electric fire, you may get shocked by the electricity and receive burns or serious injuries. (3) This is as electric switches release sparks why being switched on and off which might ignite the gas and cause an explosion.

Why is water not used for extinguishing fire by petrol and fire appliances?

Accepted Answer: Water is not used for extinguishing fires caused due to electrical faults because water is good conductor of electricity. If water is poured on an electrical fire,the water could conduct electricity causing the person trying to extinguish the fire to experience an electric shock.

Which kind of fire Cannot be extinguished using water?

APWs are designed for Class A (wood, paper, cloth) fires only. Never use water to extinguish flammable liquid fires. Water is extremely ineffective at extinguishing this type of fire, and you may, in fact, spread the fire if you try to use water on it. Never use water to extinguish an electrical fire.