Can a stored pressure water extinguisher be used to extinguishing all types of Class B fires.?

Can a stored pressure water extinguisher be used to extinguishing all types of Class B fires.?
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Certainly not ! Class B fires include petrol/oil fires as wellas grease (chip pan) fires. Using a water extinguisher will notextinguish these types of fires because - since the flammablesubstance will float on water - it simply heats the applied water,turning it to steam - resulting in an explosive 'cloud' of burningvapour.
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