WHAT KIND OF FIRES CAN EFFECTIVELY BE PUT OUT BY WATER? WHAT KIND OF FIRES IS TI NOT SUITABLE FOR? GIVE REASONS FOR BOTH CASES

Fires can effectively put out by water when wood or paper are on fire because wood and paper do not conduct electricity, therefore it is safe to put water on these kind of combustible substance. Fires which cannot be put out by water when oil or petrol are on fire because as they are lighter than water. They will float on water and will keep burning.

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SOLID FIRE IN FIRST CASE LIQUID AND ELECTRICAL IN SECOND CASE BECAUSE WATER CANNOT PUT OUT THIS TYPES OF FIRE

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why is hydrogen not used as a fuel though it has the highest calarific value?
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We practiced to use it even success has been achieved and hydrogen is expected to be the fuel of future . It may some time to use it as a fuel
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I need help urgent Question is How does carbon dioxide extinguish a fire
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